Comma Delimited Fields: values

Showing posts with label values. Show all posts

Thursday, March 29, 2012

Comparing two row values

whats the best way to compare two row values and concatenate those two

For example

Table1
---
Col1 Col2
----
A 1
A 4
B 2
C 3
A 5

I need a query to return something like
"where (A=1 or A=4 or A=5) and (b=2) and (c=3)"

Thanks in advancetry using cursor. one single SQL will not do the job.|||If I understand what you're asking, there is no need to concatenate, and certainly no need for a cursor.

What I think you want to do is SELECT rows from a table or view based on the values of four different columns (a, b, c, and d). In your case, you need to see the rows that meet all three criteria: Column A values of 1, 4, or 5 and also have Column B = 2 and Column c = d.

If I understand your question, then I'd use:SELECT *
FROM myTable
WHERE (a = 1 OR a = 4 OR a = 5)
AND b = 2
AND c = d-PatP|||You need to explain more. The way I see it you want
select * from Table1
where (Col1='A' and Col2 in (1,4,5))
or (Col1='B' and Col2=2)
or (Col1='C' and Col2=3)|||Ok let me elaborate

I have a table with two columns with the values

Col1 Col2
----
A 1
A 4
B 2
C 3
A 5

The data mentioned above is just the sample, I dunno wats its going to be in

I am looking for a query and that should form the where clause like
"where (A=1 or A=4 or A=5) and (b=2) and (c=3)"

which means it should find the identical ones first and concate with or clause and rest join with the and clause. In this case we have three A's so it should form (A=1 or A=4 or A=5) and then and clause to (b=2) and (c=3)

Thanks in advance|||I think I get what you're after.

Where do you need to plug in this "where" clause when you're done? Perhaps there's a cleaner way to get the job done.|||this only froms the string that u r looking for using cursor (i can hear some screaming!!). u know better what to do with that string

declare @.Str char(1)
declare @.LastStr char(1)
declare @.Num smallint
declare @.Out varchar(200)
set @.Out = '('
declare Cur1 cursor for select Str,Num from theTable order by str,num
open Cur1
fetch next from Cur1 into @.Str,@.Num
while @.@.fetch_status = 0
begin
if (@.LastStr is not null)
begin
if(@.LastStr <> @.Str)
set @.Out = @.Out + ') and ('
else
set @.Out = @.Out + ' or '
end
set @.Out = @.Out + @.Str + '='+ cast(@.Num as varchar)
set @.LastStr = @.Str
fetch next from Cur1 into @.Str,@.Num
end
close Cur1
deallocate Cur1
set @.Out = 'where ' + @.Out + ')'
print @.Out|||thanks upalsen, but I am thinking is there any other way to do this without cursors. Your code definetly works but looking for alternative. Thanks|||as i told earlier, it is possible without cursor as well. but that is neither going to look smarter not would perform better. performance of course is dependent on many other factors that is not clear to us form the post. if it is a onetime affair u can use cursor without any doubt. however, if u r still interested in cursor-less sql, let me know.|||thanks upalsen, yes please let me know how can we do this without cursors, I did use the cursors and its working fine, but just want to know how can we do without cursors. I appreciate your help.

Thanks in advance.|||select Col1,Col2 into #TT from theTable order by Col1,Col2
update #TT set #TT.Col1 = #TT.Col1+'_Max' /*expecting the width sufficient to hold 5 chars, else add col/change width*/ from #TT, (select Col1,max(Col2) as MaxCol2 from #TT group by Col1) as TT2 where #TT.Col1 = TT2.Col1 and #TT.Col2=TT2.MaxCol2
declare @.sql varchar(200)
set @.sql = '('
select @.sql = @.sql + left(Col1,1) + '=' + cast(Col2 as varchar) + case when len(Col1)>1 then ') and (' else ' or ' end from #TT
set @.sql = 'where ' + left(@.sql,len(@.sql)-6)
print @.sql
drop table #TT

looks meaningless though...cant find anything better than this....|||I like a challenge. I came up with this one...
IF OBJECT_ID('tempdb..#tmp') IS NOT NULL DROP TABLE #tmp
CREATE TABLE #tmp (Col1 CHAR(1), Col2 CHAR(1))
INSERT #tmp VALUES ('A','1')
INSERT #tmp VALUES ('A','4')
INSERT #tmp VALUES ('B','2')
INSERT #tmp VALUES ('C','3')
INSERT #tmp VALUES ('A','5')
INSERT #tmp VALUES ('C','1')

DECLARE @.sql VARCHAR(1000)
SET @.sql = '('

SELECT @.sql = @.sql + CASE
WHEN Col1 IS NULL THEN ''
WHEN Col2 IS NULL THEN ') AND ('
ELSE Col1 + '=' + Col2 + ' OR '
END
FROM #tmp
GROUP BY Col1, Col2
WITH ROLLUP

SELECT REPLACE(LEFT(@.sql, LEN(@.sql) - 6), ' OR )', ')')

comparing two fields

Greetings.

I am trying to write a sql that identifies all the rows in one table that do not match another. The sql needs to compare the values in two columns of each table. In the past, I've used a where not exists and a subquery to identify missing rows.

select a.block_code

from BLKPTS_ADDXY a

where not exists

(select block_code

from allblkzips as s

where s.block_code = a.block_code)

I need to add a second column from each table (zip) to the query. For some reason, it doesn't seem as straightforward as I thought it should be. Suggestions are appreciated.

Thanks.

alan

If you are using SQL 2005, try a EXCEPT JOIN. Something like:

SELECT Block_Code, Zip
FROM BLKPTS_ADDXY
EXCEPT
SELECT Block_Code, Zip
FROM allblkzips

|||I usually use a not in clause

I m pretty sure this will work..you can concat the two columns thus,

select convert(varchar(10),a.block_code)+convert(varchar(10),a.second_code), <anything else you want to select>

from BLKPTS_ADDXY a

where convert(varchar(10),a.block_code)+convert(varchar(10),a.second_code) not in

(

selectconvert(varchar(10),s.block_code)+convert(varchar(10),s.second_code)

from allblkzips as s

)

This will probably run faster than the query you are using which tries to run a where condition in an inner query with a field in the outer query, comparable with a for followed by another v/s a nested for loop in procedural programming.|||

Do either of the queries below return the results you are expecting?

Chris

SELECT a.block_code

FROM BLKPTS_ADDXY a

WHERE NOT EXISTS

(SELECT block_code
FROM allblkzips s
WHERE s.block_code = a.block_code
AND s.zip = a.zip)

SELECT a.block_code

FROM BLKPTS_ADDXY a

WHERE NOT EXISTS

(SELECT block_code
FROM allblkzips s
WHERE s.block_code = a.block_code)
OR NOT EXISTS
(SELECT block_code
FROM allblkzips s
WHERE s.zip = a.zip)

|||

I prefer the "outer join" method, since it helps enforce thinking in terms of INNER and OUTER JOINs.

select

a.block_code

from BLKPTS_ADDXY a

left outer join allblkzips s

on a.block_code = s.block_code and

a.zip = s.zip

where (s.zip is null) -- you only need to specify one column here, since the JOIN fails if both do not match

Dan

Comparing time values

I have a table called WorkItem. It models a chunk of work done during
a working day.

It has two columns that I'm interested in:

Start (smalldatetime) - the TIME the work block is begun
Duration (int) - the duration in minutes of the work block.

In another table called OvertimeRates I have information about rate
multipliers and a column that tells me the TIME that the rate
multiplier kicks in.

e.g.

OTRateBegins (smalldatetime)

In terms of calculating whether a particular work block starts after
the OTRateBegins, I could (I presume) do something like:

If CONVERT(smalldatetime, Start, 108) > CONVERT(smalldatetime,
OTRateBegins, 108)

However, would I be better off using DATEPART functions to get the hour
and minute parts of both the Start and OTRateBegins, and using them
instead? For some reason, (probably paranoia!), I am suspicious of the
CONVERT function.

Apologies for not posting DDL, but I felt that the situation didn't
really warrant it.

Thanks

EdwardI'm confused; if both columns are smalldatetime, then why are you
converting them to smalldatetime?

Stu|||On 25 Aug 2005 09:24:33 -0700, teddysnips@.hotmail.com wrote:

(snip)
>Start (smalldatetime) - the TIME the work block is begun
(...)
>OTRateBegins (smalldatetime)
(...)

>If CONVERT(smalldatetime, Start, 108) > CONVERT(smalldatetime,
>OTRateBegins, 108)

Hi Edward,

If both columns store just a time (or rather: the datepart is left at
the default value), you can use a simple comparison:

IF Start > OTRateBegins

If either or both sport a date value as well, you'll need another
solution. The convert might work (no reason for your paranoia), but
there might be better solutions as well.

If you post CREATE TABLE statements, some INSERT statements with sample
data, and expected output, it'll be easier to help you.

Best, Hugo
--

(Remove _NO_ and _SPAM_ to get my e-mail address)|||Hugo Kornelis wrote:
> On 25 Aug 2005 09:24:33 -0700, teddysnips@.hotmail.com wrote:
> (snip)
> >Start (smalldatetime) - the TIME the work block is begun
> (...)
> >OTRateBegins (smalldatetime)
> (...)
> >If CONVERT(smalldatetime, Start, 108) > CONVERT(smalldatetime,
> >OTRateBegins, 108)
> Hi Edward,
> If both columns store just a time (or rather: the datepart is left at
> the default value), you can use a simple comparison:
> IF Start > OTRateBegins
> If either or both sport a date value as well, you'll need another
> solution. The convert might work (no reason for your paranoia), but
> there might be better solutions as well.
> If you post CREATE TABLE statements, some INSERT statements with sample
> data, and expected output, it'll be easier to help you.

Thanks Hugo.

I don't particularly want to post DDL and INSERT statements, as there's
no real data to play with at the moment, and the table relations are a
good deal more complicated than I've let on.

However, suffice it to say that the datepart of the OTRateBegins is
entirely disposable - I'm only interested in the timepart element. So
I just want to ignore the datepart.

In terms of what I personally wish to do (I'm actually developing a UDF
to return accumulated minutes multiplied by the correct OT rate
multiplier) I'm not interested in the datepart of the Start column, but
in fact the datepart of this column is crucial, as it tells one when
the block of work was done (there are different multipliers for
different time periods and different days).

Hence the reason for the CONVERT function (as Stu asked), which I was
using merely to expose the timepart of the two fields. Is there a
better way? As I suggested in my original post, I *could* strip out
the HOUR and MINUTE values using the DATEPART function, and do some
rather more complex comparisons using them, but that seems rather
inefficient.

I dunno. As usual, I'm probably ignoring the obvious and elegant in
favour of the simple and quick. It was like that when I was a C
programmer - I never could get the hang of doing stuff in-line.

Anyway, many thanks for your help.

Edward|||On 25 Aug 2005 12:36:24 -0700, teddysnips@.hotmail.com wrote:

(snip)
>I don't particularly want to post DDL and INSERT statements, as there's
>no real data to play with at the moment, and the table relations are a
>good deal more complicated than I've let on.
>However, suffice it to say that the datepart of the OTRateBegins is
>entirely disposable - I'm only interested in the timepart element. So
>I just want to ignore the datepart.

Hi Edward,

The reason I asked for DDL and INSERT statements is to make sure that
there can be no misunderstanding. It may be because of me not being a
native English speaker, but I'm still not sure if your OTRateBegins
column will contain a time combined with an (irrelevant) date, or if
they will contain only the time (*).

(*) SQL Server will of course always store a date - "only the time"
means that you don't provide any date; in that case, SQL Server will use
the default date (January 1st 1900).

Anyway, here's a more generic answer for comparisons where you want to
compare only the time portion of the datetime:

- If both Column1 and Column2 contain only a time, you can compare them
with a straight comparison (Column1 > Column2); the advantage is that
the optimizer can choose to use any index on either or both of these
columns.
- If one of the columns contains a date + time and the other contains
only the time, you'll have to strip the datepart of the column with date
(Column1 > CONVERT(char(12), Column2, 114) or CONVERT(char(12), Column1,
114) > Column2); in this case, the optimizer can still use an index on
the column that has only the time - the other column is used in a
function, which precludes the use of an index.
- If both columns containt date and time, you'll have to strip both
(CONVERT(char(12), Column1, 114) > CONVERT(char(12), Column2, 114)); the
disadvantage is that the optimizer can't use the indexes on any of these
columns.

If you don't need millisecond precision, you can also use
CONVERT(char(8), Column1, 108).

>In terms of what I personally wish to do (I'm actually developing a UDF
>to return accumulated minutes multiplied by the correct OT rate
>multiplier)
(snip)

I was afraid that it'd be something like that. Yet another reason to
post the CREATE TABLE statements plus some sample data (can be made up)
and expected output, plus the code you currently have.

The use of IF in your original post suggests that you process your input
table row by row. In 99% of all cases, a set-based solution is faster,
shorter, easier to understand and hence also easier to maintain. If you
provide some more information, I (and maybe others as well) can take a
look at your logic and try our hand at converting it to a set-based
version.

(snip)
> As I suggested in my original post, I *could* strip out
>the HOUR and MINUTE values using the DATEPART function, and do some
>rather more complex comparisons using them, but that seems rather
>inefficient.

Ugh! Please don't go there - why would you even want to write messy and
complex code when a simple comparison (with CONVERT, if you have to use
it) will do?

Best, Hugo
--

(Remove _NO_ and _SPAM_ to get my e-mail address)|||OK, now I'm even more confused. Too much time behind my keyboard, I
suppose. Hugo, why can't he do a simple compare if both columns
contain a date and time? Here's my example:

DECLARE @.Start smalldatetime
DECLARE @.OTRateBegins smalldatetime

SET @.Start = '6/1/2005 4:00:00 AM'
SET @.OTRateBegins = '5/30/2005 4:00:00 AM'

IF @.Start > @.OtRateBegins
PRINT 'Start > OTRate'
ELSE
PRINT 'SPLAT'

I guess the question is: what does OTRateBegins represent? Is it the
time of the day that overtime kicks in? Or is it a calendar date and
time that represents the overtime phase of a project (e.g., you have a
contract for 100 hours, and you want to be paid the overtime rate if
you go past the 100th hour)?

Still confused.
Stu|||Stu wrote:
> OK, now I'm even more confused. Too much time behind my keyboard, I
> suppose. Hugo, why can't he do a simple compare if both columns
> contain a date and time? Here's my example:
> DECLARE @.Start smalldatetime
> DECLARE @.OTRateBegins smalldatetime
> SET @.Start = '6/1/2005 4:00:00 AM'
> SET @.OTRateBegins = '5/30/2005 4:00:00 AM'
> IF @.Start > @.OtRateBegins
> PRINT 'Start > OTRate'
> ELSE
> PRINT 'SPLAT'
> I guess the question is: what does OTRateBegins represent? Is it the
> time of the day that overtime kicks in?

Yes, which is why I can't do a simple comparison as above
> Or is it a calendar date and
> time that represents the overtime phase of a project (e.g., you have a
> contract for 100 hours, and you want to be paid the overtime rate if
> you go past the 100th hour)?

No!

Thanks Stu and Hugo for your work on this. As it happens, Hugo nailed
it in the previous post. For the comparison I'm trying to do, it is
only the time component that matters, so the use of 108 (I don't need
milliseconds!) for the CONVERT style will be fine.

As Hugo guessed, I'm NOT using a SET based solution, because the
requirements are too complicated for my tiny brain! I'm going to
persevere with my design, and see how it performs. If it's a
three-legged dog, I'll come back here with my begging bowl, and some
DDL and INSERT statements and tax your generosity some more.

But in the meantime, THANK YOU to Stu and Hugo!

Edward

comparing text fields - Second try

Tuesday, March 27, 2012

comparing text fields - Second try

Hi all,
What is the fastest and best way to compare two text fields(data type
TEXT). I just need
to know when the values are different. Are there any functions available to
do this? Please provide any code if you have it or any links regarding this
problem.
Thanks in advance...anyone?
"helpful sql" <nospam@.stopspam.com> wrote in message
news:eQ2M2AlVFHA.132@.TK2MSFTNGP14.phx.gbl...
> Hi all,
> What is the fastest and best way to compare two text fields(data type
> TEXT). I just need
> to know when the values are different. Are there any functions available
> to
> do this? Please provide any code if you have it or any links regarding
> this
> problem.
> Thanks in advance...
>|||Yeah, just a moment, coding will take some time, even I am right at home now
;-)
I coded a function to give you the "kind-of" checksum for the two columns.
Due to the fatc that the substring only brings back a varchar from the
function you can normally compare only the first 8000 bytes of a text
string, but... I coded a function which will chop the data into smaller
chunks , produces a checksum of every part and adds up the checksum. I now
that there could be a case that eventually two text columns wil produce the
same checksum, but i think that could be solution you can life with:
CREATE Function CompareText
(
@.EmployeeId INT
)
RETURNS INT
AS
BEGIN
DECLARE @.Datalength INT
DECLARE @.Restlength INT
DECLARE @.Checksum INT
DECLARE @.StartChunk INT
DECLARE @.EndChunk INT
SET @.StartChunk = 0
SET @.Datalength = (Select Datalength(Photo) From Employees Where EmployeeID
= @.EmployeeId)
SET @.Restlength = @.Datalength
SET @.Checksum = 0
While @.Restlength > 0
BEGIN
IF @.Restlength > 8000
BEGIN
SET @.EndChunk = 8000
END
ELSE
BEGIN
SET @.EndChunk = @.Restlength
END
SET @.Checksum = @.Checksum + (Select
CHECKSUM(SUBSTRING(Photo,@.StartChunk,@.Restlength)) From Employees Where
EmployeeID = @.EmployeeId)
SET @.StartChunk = @.StartChunk + @.Restlength
SET @.Restlength = @.Restlength - @.EndChunk
END
RETURN @.Checksum
END
This function has to be coded in your way, to not use the Employee Table of
the northwind database.
In this Example you can use the code as following (due to the case there is
only one text/image column in the northwin database:
Select * from Employees where dbo.Comparetext(EmployeeID) =dbo.Comparetext(EmployeeID)
HTH, Jens Suessmeyer.
--
http://www.sqlserver2005.de
--
"helpful sql" <nospam@.stopspam.com> schrieb im Newsbeitrag
news:uuX8kilVFHA.628@.tk2msftngp13.phx.gbl...
> anyone?
> "helpful sql" <nospam@.stopspam.com> wrote in message
> news:eQ2M2AlVFHA.132@.TK2MSFTNGP14.phx.gbl...
>> Hi all,
>> What is the fastest and best way to compare two text fields(data type
>> TEXT). I just need
>> to know when the values are different. Are there any functions available
>> to
>> do this? Please provide any code if you have it or any links regarding
>> this
>> problem.
>> Thanks in advance...
>>
>|||Two text fields in the same record or in related tables? If you are going to
be comparing a large number of records, then you may want to speed things up
by first determing those records where the length of the text values are not
the same. Those are obviosly different. Perhaps store their primary key IDs
in a temporary table. Once done, you can then perform the full test
comparison against the remaining few that are the same size.
"helpful sql" <nospam@.stopspam.com> wrote in message
news:eQ2M2AlVFHA.132@.TK2MSFTNGP14.phx.gbl...
> Hi all,
> What is the fastest and best way to compare two text fields(data type
> TEXT). I just need
> to know when the values are different. Are there any functions available
to
> do this? Please provide any code if you have it or any links regarding
this
> problem.
> Thanks in advance...
>|||Maybe you can use a combination of the answers in your other post and
DATALENGTH ...although this will not catch everything.
If this isn't enough for you, then I don't think you have much choice then
to do the comparison in slices of 8000 characters.
I've never had to do this so I can't help you out much. The SUBSTRING
function can return any slice you want.
Ex: select substring(columnName, 8000, 8000)
But check Datalength first, if that's doesn't match, then you don't have to
go any further.
"helpful sql" <nospam@.stopspam.com> wrote in message
news:uuX8kilVFHA.628@.tk2msftngp13.phx.gbl...
> anyone?
> "helpful sql" <nospam@.stopspam.com> wrote in message
> news:eQ2M2AlVFHA.132@.TK2MSFTNGP14.phx.gbl...
>> Hi all,
>> What is the fastest and best way to compare two text fields(data type
>> TEXT). I just need
>> to know when the values are different. Are there any functions available
>> to
>> do this? Please provide any code if you have it or any links regarding
>> this
>> problem.
>> Thanks in advance...
>>
>|||Some (bad coded) applications write chunks of data in the database in steps
of 50, 100, 200 ... steps, so comparing only the length via Datalength()
could be a problem because many columns would "seem" to be the same but they
aren´t.
Just a experience and my two cents.
HTH, Jens Suessmeyer.
--
http://www.sqlserver2005.de
--
"JT" <someone@.microsoft.com> schrieb im Newsbeitrag
news:%23MeyfzlVFHA.228@.TK2MSFTNGP12.phx.gbl...
> Two text fields in the same record or in related tables? If you are going
> to
> be comparing a large number of records, then you may want to speed things
> up
> by first determing those records where the length of the text values are
> not
> the same. Those are obviosly different. Perhaps store their primary key
> IDs
> in a temporary table. Once done, you can then perform the full test
> comparison against the remaining few that are the same size.
> "helpful sql" <nospam@.stopspam.com> wrote in message
> news:eQ2M2AlVFHA.132@.TK2MSFTNGP14.phx.gbl...
>> Hi all,
>> What is the fastest and best way to compare two text fields(data type
>> TEXT). I just need
>> to know when the values are different. Are there any functions available
> to
>> do this? Please provide any code if you have it or any links regarding
> this
>> problem.
>> Thanks in advance...
>>
>|||Am I correct in assuming that if the text values have different lengths, for
example 2000 vs. 2100, then they are different without performing a text
comparison? Once we have that list of these candidates in a temporary table,
we can exclude them from the query which performs the text compare.
"Jens Süßmeyer" <Jens@.Remove_this_For_Contacting.sqlserver2005.de> wrote in
message news:OHuoR3lVFHA.3044@.TK2MSFTNGP10.phx.gbl...
> Some (bad coded) applications write chunks of data in the database in
steps
> of 50, 100, 200 ... steps, so comparing only the length via Datalength()
> could be a problem because many columns would "seem" to be the same but
they
> aren´t.
> Just a experience and my two cents.
> HTH, Jens Suessmeyer.
> --
> http://www.sqlserver2005.de
> --
> "JT" <someone@.microsoft.com> schrieb im Newsbeitrag
> news:%23MeyfzlVFHA.228@.TK2MSFTNGP12.phx.gbl...
> > Two text fields in the same record or in related tables? If you are
going
> > to
> > be comparing a large number of records, then you may want to speed
things
> > up
> > by first determing those records where the length of the text values are
> > not
> > the same. Those are obviosly different. Perhaps store their primary key
> > IDs
> > in a temporary table. Once done, you can then perform the full test
> > comparison against the remaining few that are the same size.
> >
> > "helpful sql" <nospam@.stopspam.com> wrote in message
> > news:eQ2M2AlVFHA.132@.TK2MSFTNGP14.phx.gbl...
> >> Hi all,
> >> What is the fastest and best way to compare two text fields(data
type
> >> TEXT). I just need
> >> to know when the values are different. Are there any functions
available
> > to
> >> do this? Please provide any code if you have it or any links regarding
> > this
> >> problem.
> >>
> >> Thanks in advance...
> >>
> >>
> >
> >
>|||Why couldn't you do the following:
Create Table Foo
(
Id Int Primary Key
, TextData1 Text
, TextData2 Text
)
Insert Foo(Id, TextData1, TextData2)...
Select F.*
From Foo As F
Where Substring(F.TextData1,1,DataLength(F.TextData1))
= Substring(F.TextData2,1,DataLength(F.TextData2))
Thomas
"helpful sql" <nospam@.stopspam.com> wrote in message
news:eQ2M2AlVFHA.132@.TK2MSFTNGP14.phx.gbl...
> Hi all,
> What is the fastest and best way to compare two text fields(data type TEXT).
> I just need
> to know when the values are different. Are there any functions available to
> do this? Please provide any code if you have it or any links regarding this
> problem.
> Thanks in advance...
>|||NM..Substring returns a max of 8K
Thomas
"Thomas Coleman" <replyingroup@.anywhere.com> wrote in message
news:OYAMCQmVFHA.132@.TK2MSFTNGP14.phx.gbl...
> Why couldn't you do the following:
> Create Table Foo
> (
> Id Int Primary Key
> , TextData1 Text
> , TextData2 Text
> )
> Insert Foo(Id, TextData1, TextData2)...
>
> Select F.*
> From Foo As F
> Where Substring(F.TextData1,1,DataLength(F.TextData1))
> = Substring(F.TextData2,1,DataLength(F.TextData2))
>
> Thomas
>
> "helpful sql" <nospam@.stopspam.com> wrote in message
> news:eQ2M2AlVFHA.132@.TK2MSFTNGP14.phx.gbl...
>> Hi all,
>> What is the fastest and best way to compare two text fields(data type
>> TEXT). I just need
>> to know when the values are different. Are there any functions available to
>> do this? Please provide any code if you have it or any links regarding this
>> problem.
>> Thanks in advance...
>>
>|||> Where Substring(F.TextData1,1,DataLength(F.TextData1))
> = Substring(F.TextData2,1,DataLength(F.TextData2))
substring() only returns 8000 chars at a time...
create table FooText(textdata1 text, textdata2 text)
...use the following to build strings > 8000 chars...
--SELECT REPLICATE('a', 8000)
--SELECT REPLICATE('a', 500)
--SELECT REPLICATE('b', 20)
...paste those into an insert statement, then massage the insert statement
so that the last character is different...
INSERT FooText SELECT
'aaa...bbb',
'aaa...bba'
...now watch the result...
select count(*) from FooText
where Substring(textdata1,1, Datalength(textdata1))=Substring(textdata2,1,
Datalength(textdata1))
--
1|||Here's a quick and dirty function that will do the comparison:
Create Function dbo.TextDataAreEqual (@.Text1 Text, @.Text2 Text)
Returns Bit
AS
Begin
Declare @.Len1 Int
Declare @.Len2 Int
Set @.Len1 = DataLength(@.Text1)
Set @.Len2 = DataLength(@.Text2)
If @.Len1 <> @.Len2
Return 0
If @.Len1 <= 8000
If Substring(@.Text1, 1, @.Len1) <> Substring(@.Text2, 1, @.Len2)
Return 0
Declare @.Index Int
Set @.Index = 1
While @.Index < @.Len1
Begin
If Substring(@.Text1, @.Index, 8000) <> Substring(@.Text2, @.Index, 8000)
Return 0
Set @.Index = @.Index + 8000
End
Return 1
End
In essence, it compares on length and then the first 8K and only barring that
does it compare using the chunking methodology that people were talking about in
previous posts. You would get a speed improvment by narrowing the list by
comparing datalength in the main query itself. So something like:
Select *
From (
Select T1.Id, T1.TextField1, T1.TextField2
From dbo.TableName As T1
Where T1.DataLength(T1.TextField1) = T1.DataLength(T1.TextField2)
) As T
Where dbo.TextDataAreEqual(T.TextField1, T.TextField2) = 1
Thomas|||OK that could be done in the query which call´s the function:
Select * from Employees where dbo.Comparetext(EmployeeID) =dbo.Comparetext(EmployeeID)
Where Datalength(EmployeeID) <> Datalength(EmployeeID)
Assuming that u don´t have the same column as shown above, just for the
syntax.
HTH, Jens Suessmeyer.
"JT" <someone@.microsoft.com> schrieb im Newsbeitrag
news:el0N7MmVFHA.1508@.tk2msftngp13.phx.gbl...
> Am I correct in assuming that if the text values have different lengths,
> for
> example 2000 vs. 2100, then they are different without performing a text
> comparison? Once we have that list of these candidates in a temporary
> table,
> we can exclude them from the query which performs the text compare.
> "Jens Süßmeyer" <Jens@.Remove_this_For_Contacting.sqlserver2005.de> wrote
> in
> message news:OHuoR3lVFHA.3044@.TK2MSFTNGP10.phx.gbl...
>> Some (bad coded) applications write chunks of data in the database in
> steps
>> of 50, 100, 200 ... steps, so comparing only the length via Datalength()
>> could be a problem because many columns would "seem" to be the same but
> they
>> aren´t.
>> Just a experience and my two cents.
>> HTH, Jens Suessmeyer.
>> --
>> http://www.sqlserver2005.de
>> --
>> "JT" <someone@.microsoft.com> schrieb im Newsbeitrag
>> news:%23MeyfzlVFHA.228@.TK2MSFTNGP12.phx.gbl...
>> > Two text fields in the same record or in related tables? If you are
> going
>> > to
>> > be comparing a large number of records, then you may want to speed
> things
>> > up
>> > by first determing those records where the length of the text values
>> > are
>> > not
>> > the same. Those are obviosly different. Perhaps store their primary key
>> > IDs
>> > in a temporary table. Once done, you can then perform the full test
>> > comparison against the remaining few that are the same size.
>> >
>> > "helpful sql" <nospam@.stopspam.com> wrote in message
>> > news:eQ2M2AlVFHA.132@.TK2MSFTNGP14.phx.gbl...
>> >> Hi all,
>> >> What is the fastest and best way to compare two text fields(data
> type
>> >> TEXT). I just need
>> >> to know when the values are different. Are there any functions
> available
>> > to
>> >> do this? Please provide any code if you have it or any links regarding
>> > this
>> >> problem.
>> >>
>> >> Thanks in advance...
>> >>
>> >>
>> >
>> >
>>
>

Comparing Smalldatetime column

quote:

> I have two Smalldatetime columns. One of the columns have
> NULL values in some of the rows. When I compare the two
> columns, I don't get the rows that have NULL values (I am
> comparing them to be NOT the same e.g Select * from
> mytable where column1 <> column2). I get all the rows that
> are not the same but have values but not the NULL columns.
> How can I get the NULL columns too '
>
> Thanks for help.

|||> b) you could say SET ANSI_NULLS OFF
ANSI_NULLS OFF won't evaluate x<>NULL to TRUE or FALSE - it's still UNKNOWN.
David Portas
--
Please reply only to the newsgroup
--|||I guess I have something wrong in my query. I also was
trying to exclude the values in one of the columns which
was the dates that had 1900 in it (E.g NOT Like '%1900%').
I was trying to add that statement to
SELECT *
FROM mytable
WHERE column1 <> column2
OR column1 IS NULL
OR column2 IS NULL
--OR/AND column1 Not like '%1900%'
but somehow it is eliminating the NULL columns.
Thanks.

quote:

>--Original Message--
>ANSI_NULLS OFF won't evaluate x<>NULL to TRUE or FALSE -

it's still UNKNOWN.

quote:

>--
>David Portas
>--
>Please reply only to the newsgroup
>--
>
>.
>

|||I guess I have something wrong in my query. I also was
trying to exclude the values in one of the columns which
was the dates that had 1900 in it (E.g NOT Like '%1900%').
I was trying to add that statement to
SELECT *
FROM mytable
WHERE column1 <> column2
OR column1 IS NULL
OR column2 IS NULL
--OR/AND column1 Not like '%1900%'
but somehow it is eliminating the NULL columns.
Thanks.

quote:

>--Original Message--
>ANSI_NULLS OFF won't evaluate x<>NULL to TRUE or FALSE -

it's still UNKNOWN.

quote:

>--
>David Portas
>--
>Please reply only to the newsgroup
>--
>
>.
>

|||SORRY FOR THE DOUBLE POST...

quote:

>--Original Message--
>I guess I have something wrong in my query. I also was
>trying to exclude the values in one of the columns which
>was the dates that had 1900 in it (E.g NOT Like '%

1900%').

quote:

>I was trying to add that statement to
>SELECT *
> FROM mytable
> WHERE column1 <> column2
> OR column1 IS NULL
> OR column2 IS NULL
>--OR/AND column1 Not like '%1900%'
>but somehow it is eliminating the NULL columns.
>Thanks.
>
>it's still UNKNOWN.
>.
>

|||It helps if you can post some code to reproduce your problem and show your
required results. It's not clear to me exactly what result you're trying to
get in this case.
When combining AND and OR you have to watch out for the order of precedence.
Use parentheses to make the order of evaluation clear otherwise x OR y AND z
is evaluated as x OR (y AND z).
Don't use LIKE to compare dates. LIKE performs a string comparison and if
you use it on dates then every date has to be cast as a string. Best way to
eliminate the year 1900 is to test for a date >= 1901-01-01.
Here's some code to reproduce a result that *may* be what you want:
CREATE TABLE MyTable (keycol INTEGER PRIMARY KEY, column1 SMALLDATETIME,
column2 SMALLDATETIME)
INSERT INTO MyTable VALUES (1,'20030101','20030101')
INSERT INTO MyTable VALUES (2,'20030101','20030102')
INSERT INTO MyTable VALUES (3,'19000101','19000101')
INSERT INTO MyTable VALUES (4,'19000101','20030101')
INSERT INTO MyTable VALUES (5,'20030101','19000101')
INSERT INTO MyTable VALUES (6,'19000101',NULL)
INSERT INTO MyTable VALUES (7,NULL,'19000101')
INSERT INTO MyTable VALUES (8,'20030101',NULL)
INSERT INTO MyTable VALUES (9,NULL,'20030101')
INSERT INTO MyTable VALUES (10,NULL,NULL)
SELECT *
FROM MyTable
WHERE
COALESCE(column1,'19000101') <> COALESCE(column2,'19000101')
AND
(column1 >= '19010101' OR column2 >= '19010101')
Which returns the rows where Keycol is 2,4,5,8 and 9.
If that's not it and you need more help then you'll have to specify which
rows you want to be included in your result. I should have covered all the
relevant combinations.
Hope this helps.
David Portas
--
Please reply only to the newsgroup
--|||Thanks a lot..........
James.

quote:

>--Original Message--
>It helps if you can post some code to reproduce your

problem and show your

quote:

>required results. It's not clear to me exactly what

result you're trying to

quote:

>get in this case.
>When combining AND and OR you have to watch out for the

order of precedence.

quote:

>Use parentheses to make the order of evaluation clear

otherwise x OR y AND z

quote:

>is evaluated as x OR (y AND z).
>Don't use LIKE to compare dates. LIKE performs a string

comparison and if

quote:

>you use it on dates then every date has to be cast as a

string. Best way to

quote:

>eliminate the year 1900 is to test for a date >= 1901-01-

01.

quote:

>Here's some code to reproduce a result that *may* be what

you want:

quote:

>CREATE TABLE MyTable (keycol INTEGER PRIMARY KEY, column1

SMALLDATETIME,

quote:

>column2 SMALLDATETIME)
>INSERT INTO MyTable VALUES (1,'20030101','20030101')
>INSERT INTO MyTable VALUES (2,'20030101','20030102')
>INSERT INTO MyTable VALUES (3,'19000101','19000101')
>INSERT INTO MyTable VALUES (4,'19000101','20030101')
>INSERT INTO MyTable VALUES (5,'20030101','19000101')
>INSERT INTO MyTable VALUES (6,'19000101',NULL)
>INSERT INTO MyTable VALUES (7,NULL,'19000101')
>INSERT INTO MyTable VALUES (8,'20030101',NULL)
>INSERT INTO MyTable VALUES (9,NULL,'20030101')
>INSERT INTO MyTable VALUES (10,NULL,NULL)
>SELECT *
> FROM MyTable
> WHERE
> COALESCE(column1,'19000101') <> COALESCE

(column2,'19000101')

quote:
d">
> AND
> (column1 >= '19010101' OR column2 >= '19010101')
>Which returns the rows where Keycol is 2,4,5,8 and 9.
>If that's not it and you need more help then you'll have

to specify which

quote:

>rows you want to be included in your result. I should

have covered all the

quote:

>relevant combinations.
>Hope this helps.
>--
>David Portas
>--
>Please reply only to the newsgroup
>--
>
>.
>

Comparing Smalldatetime column

I have two Smalldatetime columns. One of the columns have
NULL values in some of the rows. When I compare the two
columns, I don't get the rows that have NULL values (I am
comparing them to be NOT the same e.g Select * from
mytable where column1 <> column2). I get all the rows that
are not the same but have values but not the NULL columns.
How can I get the NULL columns too '
Thanks for help.IS NULL and IS NOT NULL are the predicates used to test for the presence or
absence of NULL:
SELECT *
FROM mytable
WHERE column1 <> column2
OR column1 IS NULL
OR column2 IS NULL
You can read about three-value logic and NULL values in Books Online:
http://msdn.microsoft.com/library/en-us/acdata/ac_8_qd_02_8pwy.asp
In general a comparison of anything to NULL is always UNKNOWN which means
NULL values are excluded by statements like
...
WHERE x <> y
--
David Portas
--
Please reply only to the newsgroup
--|||ANSI defines NULL = NULL as false.
NULL is the abscence of a value and, NULL does not equal NULL.
You can:
a) use IS NULL to perform the test or
b) you could say SET ANSI_NULLS OFF
Books Online will have lot's more info on each option... I hope this helps,
--
Brian Moran
Principal Mentor
Solid Quality Learning
SQL Server MVP
http://www.solidqualitylearning.com
"James" <anonymous@.discussions.microsoft.com> wrote in message
news:000e01c3dc43$7c50b750$a101280a@.phx.gbl...
> I have two Smalldatetime columns. One of the columns have
> NULL values in some of the rows. When I compare the two
> columns, I don't get the rows that have NULL values (I am
> comparing them to be NOT the same e.g Select * from
> mytable where column1 <> column2). I get all the rows that
> are not the same but have values but not the NULL columns.
> How can I get the NULL columns too '
>
> Thanks for help.|||> b) you could say SET ANSI_NULLS OFF
ANSI_NULLS OFF won't evaluate x<>NULL to TRUE or FALSE - it's still UNKNOWN.
--
David Portas
--
Please reply only to the newsgroup
--|||I guess I have something wrong in my query. I also was
trying to exclude the values in one of the columns which
was the dates that had 1900 in it (E.g NOT Like '%1900%').
I was trying to add that statement to
SELECT *
FROM mytable
WHERE column1 <> column2
OR column1 IS NULL
OR column2 IS NULL
--OR/AND column1 Not like '%1900%'
but somehow it is eliminating the NULL columns.
Thanks.
>--Original Message--
>> b) you could say SET ANSI_NULLS OFF
>ANSI_NULLS OFF won't evaluate x<>NULL to TRUE or FALSE -
it's still UNKNOWN.
>--
>David Portas
>--
>Please reply only to the newsgroup
>--
>
>.
>|||I guess I have something wrong in my query. I also was
trying to exclude the values in one of the columns which
was the dates that had 1900 in it (E.g NOT Like '%1900%').
I was trying to add that statement to
SELECT *
FROM mytable
WHERE column1 <> column2
OR column1 IS NULL
OR column2 IS NULL
--OR/AND column1 Not like '%1900%'
but somehow it is eliminating the NULL columns.
Thanks.
>--Original Message--
>> b) you could say SET ANSI_NULLS OFF
>ANSI_NULLS OFF won't evaluate x<>NULL to TRUE or FALSE -
it's still UNKNOWN.
>--
>David Portas
>--
>Please reply only to the newsgroup
>--
>
>.
>|||SORRY FOR THE DOUBLE POST...
>--Original Message--
>I guess I have something wrong in my query. I also was
>trying to exclude the values in one of the columns which
>was the dates that had 1900 in it (E.g NOT Like '%
1900%').
>I was trying to add that statement to
>SELECT *
> FROM mytable
> WHERE column1 <> column2
> OR column1 IS NULL
> OR column2 IS NULL
>--OR/AND column1 Not like '%1900%'
>but somehow it is eliminating the NULL columns.
>Thanks.
>>--Original Message--
>> b) you could say SET ANSI_NULLS OFF
>>ANSI_NULLS OFF won't evaluate x<>NULL to TRUE or FALSE -
>it's still UNKNOWN.
>>--
>>David Portas
>>--
>>Please reply only to the newsgroup
>>--
>>
>>.
>.
>|||It helps if you can post some code to reproduce your problem and show your
required results. It's not clear to me exactly what result you're trying to
get in this case.
When combining AND and OR you have to watch out for the order of precedence.
Use parentheses to make the order of evaluation clear otherwise x OR y AND z
is evaluated as x OR (y AND z).
Don't use LIKE to compare dates. LIKE performs a string comparison and if
you use it on dates then every date has to be cast as a string. Best way to
eliminate the year 1900 is to test for a date >= 1901-01-01.
Here's some code to reproduce a result that *may* be what you want:
CREATE TABLE MyTable (keycol INTEGER PRIMARY KEY, column1 SMALLDATETIME,
column2 SMALLDATETIME)
INSERT INTO MyTable VALUES (1,'20030101','20030101')
INSERT INTO MyTable VALUES (2,'20030101','20030102')
INSERT INTO MyTable VALUES (3,'19000101','19000101')
INSERT INTO MyTable VALUES (4,'19000101','20030101')
INSERT INTO MyTable VALUES (5,'20030101','19000101')
INSERT INTO MyTable VALUES (6,'19000101',NULL)
INSERT INTO MyTable VALUES (7,NULL,'19000101')
INSERT INTO MyTable VALUES (8,'20030101',NULL)
INSERT INTO MyTable VALUES (9,NULL,'20030101')
INSERT INTO MyTable VALUES (10,NULL,NULL)
SELECT *
FROM MyTable
WHERE
COALESCE(column1,'19000101') <> COALESCE(column2,'19000101')
AND
(column1 >= '19010101' OR column2 >= '19010101')
Which returns the rows where Keycol is 2,4,5,8 and 9.
If that's not it and you need more help then you'll have to specify which
rows you want to be included in your result. I should have covered all the
relevant combinations.
Hope this helps.
--
David Portas
--
Please reply only to the newsgroup
--|||Thanks a lot..........
James.
>--Original Message--
>It helps if you can post some code to reproduce your
problem and show your
>required results. It's not clear to me exactly what
result you're trying to
>get in this case.
>When combining AND and OR you have to watch out for the
order of precedence.
>Use parentheses to make the order of evaluation clear
otherwise x OR y AND z
>is evaluated as x OR (y AND z).
>Don't use LIKE to compare dates. LIKE performs a string
comparison and if
>you use it on dates then every date has to be cast as a
string. Best way to
>eliminate the year 1900 is to test for a date >= 1901-01-
01.
>Here's some code to reproduce a result that *may* be what
you want:
>CREATE TABLE MyTable (keycol INTEGER PRIMARY KEY, column1
SMALLDATETIME,
>column2 SMALLDATETIME)
>INSERT INTO MyTable VALUES (1,'20030101','20030101')
>INSERT INTO MyTable VALUES (2,'20030101','20030102')
>INSERT INTO MyTable VALUES (3,'19000101','19000101')
>INSERT INTO MyTable VALUES (4,'19000101','20030101')
>INSERT INTO MyTable VALUES (5,'20030101','19000101')
>INSERT INTO MyTable VALUES (6,'19000101',NULL)
>INSERT INTO MyTable VALUES (7,NULL,'19000101')
>INSERT INTO MyTable VALUES (8,'20030101',NULL)
>INSERT INTO MyTable VALUES (9,NULL,'20030101')
>INSERT INTO MyTable VALUES (10,NULL,NULL)
>SELECT *
> FROM MyTable
> WHERE
> COALESCE(column1,'19000101') <> COALESCE
(column2,'19000101')
> AND
> (column1 >= '19010101' OR column2 >= '19010101')
>Which returns the rows where Keycol is 2,4,5,8 and 9.
>If that's not it and you need more help then you'll have
to specify which
>rows you want to be included in your result. I should
have covered all the
>relevant combinations.
>Hope this helps.
>--
>David Portas
>--
>Please reply only to the newsgroup
>--
>
>.
>

Comparing result set values of 2 queries ?

Any assistance would be so helpful !!

We have 2 tables.. lets call them INV and COST

Table INV and COST have 3 related columns, namely ID,AMOUNT and VAT. As shown below...

ID | AMOUNT | VAT ( INV TABLE )
1 |20.125 |2.896
2 |10.524 |1.425

ID | AMOUNT | VAT ( COST TABLE )
1 |20.125 |4.821 ... different to ID 1 in INV Table
2 |10.524 |1.425

If you look above, I need to sum the AMOUNT and VAT columns and get a value for each ID, then compare the two tables and get the ID's that have different values...in this case I would need a result saying ID1 as the total of INV TABLE ID1 (23.021) is different to the corresponding ID1 row in COST TABLE (24.946)

Thats it ?

Please could someone out there offer some ideas ?

THANKS

JONselect t1.[id] from [inv table] t1 inner join [cost table] t2 on t1.[id]=t2.[id] where t1.amount+t1.vat<>t2.amount+t2.vat|||Hi Rafala, thanks so much for the assistance,GREATLY APPRECIATED

I have a slight problem though...

Table COST can be made up of multiple entries/rows..ie, ID is not the primary key, so it is possible to have multiple rows, all with the same ID.

Table INV has single row entries for each ID(Primary Key)

Basically, INV table has 1 row, say ID 7
COST Table could have 4 rows, all ID 7. I need to add the AMOUNT and VAT columns for all 4 rows of Table COST and measure that up against the total (AMOUNT+VAT)for the single row of Table INV.

ie.

COST
id7 12 4
id7 21 7
id7 35 1
id7 10 87 ...TOTAL 177

INV
id7 78 99 ...TOTAL 177 ..In this case all is well

Should the TOTAL of ALL rows under cost.amount and cost.vat for cost.ID7 not equal TOTAL of inv.amount+inv.vat for inv.ID7, I would need it to bring up this problem ID...

Am I making much sense...

CHEERS|||Hi Rafala, thanks so much for the assistance,GREATLY APPRECIATED

I have a slight problem though...

Table COST can be made up of multiple entries/rows..ie, ID is not the primary key, so it is possible to have multiple rows, all with the same ID.

Table INV has single row entries for each ID(Primary Key)

Basically, INV table has 1 row, say ID 7
COST Table could have 4 rows, all ID 7. I need to add the AMOUNT and VAT columns for all 4 rows of Table COST and measure that up against the total (AMOUNT+VAT)for the single row of Table INV.

ie.

COST
id7 12 4
id7 21 7
id7 35 1
id7 10 87 ...TOTAL 177

INV
id7 78 99 ...TOTAL 177 ..In this case all is well

Should the TOTAL of ALL rows under cost.amount and cost.vat for cost.ID7 not equal TOTAL of inv.amount+inv.vat for inv.ID7, I would need it to bring up this problem ID...

Am I making much sense...

CHEERS|||select t1.[id] from [inv table] t1 inner join (select t2.[id], cost_total=sum(t2.amount+t2.vat) from [cost table] t2 where t1.[id]=t2.[id] group by t2.[id]) co where t1.[id] = co.[id] and (t1.amount+t1.vat)<>co.cost_total

Comparing result set values of 2 queries ?

Sunday, March 25, 2012

Comparing multiple values in an iif clause

Hello,

Just want to ask..

Does anyone have an idea how i can compare multiple values in the iif() clause like

IDType IN (1, 2, 3, 4)

This one doesnt work

iif(IDType IN (1, 2, 3, 4), true, false)

Please help..

Thanks..

One option is to use an IIF function call like this:

=iif(Fields!IDType.Value = 1 OR Fields!IDType.Value = 2 OR Fields!IDType.Value = 3 OR ..., true, false)

In some cases (e.g. numeric values), you could use alternatives to the IIF function:
* =Choose(...)
http://msdn.microsoft.com/library/en-us/vblr7/html/vafctchoose.asp
* =Switch(...)
http://msdn.microsoft.com/library/en-us/vblr7/html/vafctswitch.asp

-- Robert

Comparing Financial values across random dates

I submitted this issue to the reporting services thread, but I'm beginning to think I may have to do something in SSAS:

I want to enable my users to select 2 random month end dates in a report parameter. After selecting these dates, I want to be able to take the corresponding financial values, be able to line them up next to each other in a report, and calculate the difference. Obviously in a matrix I can line the values up, but I am then not able to calc a difference. I do have a time hierarchy that allows me to do this across dates at the same level of granularity, i.e. year to year, qtr to qtr, etc., but if my users want to compare February month end to November month end, it's a problem. I am more than willing to add calculated members to the cube to get this done, I just haven't figured out the MDX for it.

Thanks in Advance...

I think this can be done without any calculated members, simply by using the following query:

SELECT

{Measures.ImportantFinancialValue1, Measures.ImportantFinancialValue2, ...} ON COLUMNS

, {Time.Date1, Time.Date2} ON ROWS

FROM Cube

HTH,

Mosha (http://www.mosha.com/msolap)

|||

Mosha-

Thanks for your quick response. I am using SSAS on top of SSRS, and am trying to avoid writing MDX as these reports may get very involved. Can I replicate this in a calc'd member, can it be dynamic enough to accept values at runtime?

|||I am supposed to find out the total number of open account between February - April and i am having difficulties. Below is a working statement for SQL which i am supposed to do in MDX for my Cube:

SELECT COUNT(*) AS Expr1

FROM ConsumerAccount

WHERE (DATEPART(yyyy, AccountOpenedDate) = '2007')

AND (DATEPART(mm, AccountOpenedDate) IN (02, 03, 04))

I have a cube called Batch process, column AccountOpenedDate and CrearedOnDate, how do i do it

Thursday, March 22, 2012

Comparing Dates in Previous and Current Rows

Dear All,
I am having textboxes on two detail rows (as an example), I want to calculate the date difference between two textbox date values. The date difference is between the previous row and the current row. As an example:

A B

5/2/2005 09:39:02 AM	5/3/2005 06:29:32 PM
5/4/2005 08:21:31 AM	5/5/2005 07:02:29 PM
5/6/2005 09:52:33 AM	5/6/2005 07:04:31 PM
5/7/2005 09:20:33 AM	5/8/2005 08:26:36 AM

I want to do A2-B1 in the report. I need to calculate the date difference between 5/4/2005 8:21:31 AM and 5/3/2005 6:29:32 PM as an example. The same thing for A3 and B2. ...
Do you have any idea how I can achieve this? Is there a way to do that? Do I need some special code to accomplish this?
Thank you for your help.
BTHi,
a way is to create a store proc that make the calculation
(fetching results in a temp table).|||
yes you can
you can use formula like this
=ReportItems!A.Value.Subtract(ReportItems!B.Value)
where A and B are the name of the cells in your table
noteSubtractfunction in datetime returns timespan|||

Hi,
IMHO the formula
ReportItems!A.Value.Subtract(ReportItems!B.Value)
calculate difference between value of the same row.
I've understood that Salmiya have to calculate between a value of column A with
value of column B, but of previous row.

|||Yes you are right. I have to compare previous row with current one.
Thank you.|||tblDates :
PK A B
----------------

1 5/2/2005 09:39:02 AM	5/3/2005 06:29:32 PM
2 5/4/2005 08:21:31 AM	5/5/2005 07:02:29 PM
3 5/6/2005 09:52:33 AM	5/6/2005 07:04:31 PM
4 5/7/2005 09:20:33 AM	5/8/2005 08:26:36 AM

You can do :
Select [Difference] = A-IsNull((Select B from tblDates where PK=2 ),0) from tblDates where PK=3
HTH,
Best Regards,
Hemchand|||Hi.....
U can use =ReportItems!textbox1.Value - ReportItems!textbox2.Value
Then U will get it..........
Best Regards....

Comparing Dates

Does anyone know of a quick and easy to compare 2 datetime values based only on the month and year.

For example,

FromDate = 11/30/2004
ToDate = 12/30/2004

I just need to compare the 11/2004 to 12/2004 using function like <=, =, >=, etc.

Any suggestions?

ThanksI'd use:IF Convert(CHAR(7), FromDate, 121) = Convert(CHAR(7), ToDate, 121)-PatP|||...or:

CONVERT(CHAR(7), [YourDate], 120) + '/01'

...will implicitly convert your date value to the first day of the month.|||...or:

CONVERT(CHAR(7), [YourDate], 120) + '/01'

...will implicitly convert your date value to the first day of the month.My machine doesn't like the mixed separators... It does Ok with:CONVERT(CHAR(7), [YourDate], 120) + '-01'-PatP|||My bad. I meant "-01"...|||I'd create a computed column. This way you can index it and avoid table/clustered index scan overhead.sql sql

Comparing data in two consecutive rows from a single table

I'm trying to come up with an elegant, simple way to compare two
consecutive values from the same table.

For instance:

SELECT TOP 2 datavalues FROM myTable ORDER BY timestamp DESC

That gives me the two latest values. I want to test the rate of
change of these values. If the top row is a 50% increase over the row
below it, I'll execute some special logic.

What are my options? The only ways I can think of doing this are
pretty ugly. Any help is very much appreciated. Thanks!

B.>> SELECT TOP 2 datavalues FROM myTable ORDER BY timestamp DESC;

That gives me the two latest values. I want to test the rate of
change of these values. If the top row is a 50% increase over the row
below it, I'll execute some special logic. <<

TIMESTAMP is a reserved word in Standard SQL, which matches T-SQL
DATETIME. Rows have no physical ordering in a table, so that part
makes no sense. Or it means that you still have a mental model of a
sequential file -- probably a clipboard with a single column for data
points and a single column for a timeclock imprint.

That is not how to think about it in an RDBMS. If you have an event,
then you need to show a duration. This is Einstein's physics and
Zeno's paradoxes. Furthermore, each row must represent a complete
fact in itself, not half a fact. Let's try again:

CREATE TABLE
(start_datavalue DECIMAL(8,4) NOT NULL,
end_datavalue DECIMAL(8,4) NOT NULL,
start_time TIMESTAMP DEFAULT CURRENT_TIMESTAMP
NOT NULL PRIMARY KEY,
end_time TIMESTAMP, -- null means still open
..
);

As each sample is taken, do an insert and an update (pardon my
Standard SQL-92):

BEGIN ATOMIC

INSERT INTO Foobar
VALUES (:datavalue, (SELECT start_time FROM Foobar WHERE end_time IS
NULL),
CURRENT_TIMESTAMP, NULL, ..);

UPDATE Foobar
SET end_time = CURRENT_TIMESTAMP
WHERE end_time IS NULL;

END;

I think the code you want is a bit more complex. A change over time
needs to consider the time involved. It is one thing for a car to go
from 0 to 60 mph in 10 seconds and quite another for it to take 10
hours. But without considering the rate of change:

SELECT start_datavalue, end_datavalue, start_time, end_time
FROM Foobar
WHERE start_value/end_time >= 0.5000
OR start_value/end_time >= 2.0000);

This shows the rows where things doubled or halved in their timeslots,
you can add (end_time-start_time) to get the duration, do other
ratios, etc.|||--CELKO-- (jcelko212@.earthlink.net) writes:
> TIMESTAMP is a reserved word in Standard SQL, which matches T-SQL
> DATETIME. Rows have no physical ordering in a table, so that part
> makes no sense. Or it means that you still have a mental model of a
> sequential file -- probably a clipboard with a single column for data
> points and a single column for a timeclock imprint.

So why not? I bet the underlying business problem looks a whole like
that!

You know, most people who are using databases are trying to solve
real-world problems, not do exercises in relational algebra.

--
Erland Sommarskog, SQL Server MVP, esquel@.sommarskog.se

Books Online for SQL Server SP3 at
http://www.microsoft.com/sql/techin.../2000/books.asp|||"--CELKO--" <jcelko212@.earthlink.net> wrote in message
news:18c7b3c2.0406021337.1ff11c89@.posting.google.c om...
> >> SELECT TOP 2 datavalues FROM myTable ORDER BY timestamp DESC;
> That gives me the two latest values. I want to test the rate of
> change of these values. If the top row is a 50% increase over the row
> below it, I'll execute some special logic. <<
> TIMESTAMP is a reserved word in Standard SQL, which matches T-SQL
> DATETIME. Rows have no physical ordering in a table, so that part
> makes no sense. Or it means that you still have a mental model of a
> sequential file -- probably a clipboard with a single column for data
> points and a single column for a timeclock imprint.
> That is not how to think about it in an RDBMS. If you have an event,
> then you need to show a duration. This is Einstein's physics and
> Zeno's paradoxes. Furthermore, each row must represent a complete
> fact in itself, not half a fact. Let's try again:

I have to disagree here Joe.

For example, one of our tables records the time a banner ad is served.
There's no "begin and end" there's an instant.|||IF EXISTS(
SELECT TOP 1
datavalues as firstdatavalue,
(SELECT TOP 1
datavalues
FROM myTable AS myTable2
WHERE myTable2.timestamp < myTable.timestamp
ORDER BY timestamp DESC
) AS nextdatavalue
FROM myTable
ORDER BY timestamp DESC
)
BEGIN
-- ** Do My special Logic
END

*** Sent via Developersdex http://www.developersdex.com ***
Don't just participate in USENET...get rewarded for it!|||Here's one that only needs to do one table scan...

IF
(SELECT
MAX(Top2.datavalues) / MIN(Top2.datavalues)
FROM
(SELECT
TOP 2 datavalues
FROM
myTable
ORDER BY timestamp DESC) AS Top2
) >= 2
BEGIN
...blah blah blah...
END

"Bryan Guilliams" <bryanguilliams@.hotmail.com> wrote in message
news:3d0adf3a.0406020801.22ece337@.posting.google.c om...
> I'm trying to come up with an elegant, simple way to compare two
> consecutive values from the same table.
> For instance:
> SELECT TOP 2 datavalues FROM myTable ORDER BY timestamp DESC
> That gives me the two latest values. I want to test the rate of
> change of these values. If the top row is a 50% increase over the row
> below it, I'll execute some special logic.
> What are my options? The only ways I can think of doing this are
> pretty ugly. Any help is very much appreciated. Thanks!
> B.|||On Wed, 2 Jun 2004 22:40:31 -0400, Jonathan Amend wrote:

>Here's one that only needs to do one table scan...

Nice! :-)

Best, Hugo
--

(Remove _NO_ and _SPAM_ to get my e-mail address)|||Hugo Kornelis <hugo@.pe_NO_rFact.in_SPAM_fo> wrote in message news:<499sb09pcde2ltgf2f9n610go5l63l4glh@.4ax.com>...

> Hi Bryan,
> IF (SELECT TOP 1 datavalues FROM myTable ORDER BY timestamp DESC) >
> (SELECT TOP 1 datavalues FROM
> (SELECT TOP 2 datavalues, timestamp
> FROM myTable ORDER BY timestamp DESC) A
> ORDER BY timestamp ASC) * 1.5
> BEGIN
> do something
> END
>
> Best, Hugo

Hugo, this works perfectly and is exactly what I was looking for! Thanks a ton!

B.|||You're right, of course, but a few words in my defense...

jcelko212@.earthlink.net (--CELKO--) wrote in message news:<18c7b3c2.0406021337.1ff11c89@.posting.google.com>...

> TIMESTAMP is a reserved word in Standard SQL, which matches T-SQL
> DATETIME. Rows have no physical ordering in a table, so that part
> makes no sense. Or it means that you still have a mental model of a
> sequential file -- probably a clipboard with a single column for data
> points and a single column for a timeclock imprint.

I changed the table and column names from the real ones out of habit.
The actual datetime column is called 'time_stamp', so no problem
there. And though rows have no physical ordering in a table, they
absolutely have a virtual ordering when you use an ORDER BY statement,
which I have.

> I think the code you want is a bit more complex. A change over time
> needs to consider the time involved. It is one thing for a car to go
> from 0 to 60 mph in 10 seconds and quite another for it to take 10
> hours. But without considering the rate of change:

Luckily, the problem is not that complex. I'm pulling data from
another source that already takes care of all of that. I can be
completely confident that the data are exactly x minutes apart and
need only act if the most recent value is significantly greater than
the previous one.

I very much appreciate the instruction and help. Everything you wrote
was very informative and I thank you!

B.|||>> I have to disagree here Joe. For example, one of our tables
records the time a banner ad is served. There's no "begin and end"
there's an instant. <<

Your banner ads have no duration? Wow! That means that if I want to
run 1000 ads, and a database that records times to 1/1000 of a second,
then I can put 1000 ads in each second :)

Time intervals in SQL are shown as either (start, finish) and (start,
duration) -- look up the stuff for the OVERLAPS predicate in Standard
SQL.|||>> So why not? I bet the underlying business problem looks a whole
like
that! <<

Copying a paper form directly into a RDBMS is not a good idea. This
problem sounds like a history; history is a series of durations.

>> You know, most people who are using databases are trying to solve
real-world problems, not do exercises in relational algebra. <<

That is like saying the people at Enron ignored math because they "are
trying to solve real-world problems, not do exercises in relational
algebra" :)|||--CELKO-- wrote:
> That is like saying the people at Enron ignored math because they "are
> trying to solve real-world problems, not do exercises in relational
> algebra" :)

Actually, they were trying to *avoid* real-world problems. ;)

Zach|||"--CELKO--" <jcelko212@.earthlink.net> wrote in message
news:18c7b3c2.0406030904.c61d8f3@.posting.google.co m...
> >> I have to disagree here Joe. For example, one of our tables
> records the time a banner ad is served. There's no "begin and end"
> there's an instant. <<
> Your banner ads have no duration? Wow! That means that if I want to
> run 1000 ads, and a database that records times to 1/1000 of a second,
> then I can put 1000 ads in each second :)

Serving them has no duration, no.

And we serve (and record the serving) of over 14 million banner ads a day.
I'll let you do the math.

> Time intervals in SQL are shown as either (start, finish) and (start,
> duration) -- look up the stuff for the OVERLAPS predicate in Standard
> SQL.

See, I'm not talking about time intervals, you are.|||>> Serving them has no duration, no. And we serve (and record the
serving) of over 14 million banner ads a day. <<

Perhaps I do not understand what "serving" means; can you give me a
scenario. I am a customer; I want to run a banner ad. My banner
needs to be up from Christmas to New Years day. It needs to run
between 0600 UTC to 1200 UTC everyday, and it is 5 seconds long. What
are you recording so that I get the exposure for which I am paying?|||On 4 Jun 2004 12:25:52 -0700, --CELKO-- wrote:

>>> Serving them has no duration, no. And we serve (and record the
> serving) of over 14 million banner ads a day. <<
> Perhaps I do not understand what "serving" means; can you give me a
> scenario. I am a customer; I want to run a banner ad. My banner
> needs to be up from Christmas to New Years day. It needs to run
> between 0600 UTC to 1200 UTC everyday, and it is 5 seconds long. What
> are you recording so that I get the exposure for which I am paying?

I should let Greg explain it himself, but I can't seem to hold myself back
...

The duration you describe would be just what is needed to select at any
given instant which ad(s) should be active. However, once the ad has been
selected and HTML has been emitted to have it appear on the page, the
instant that it was emitted will be recorded in the database. A time
instant, not a duration.|||"--CELKO--" <jcelko212@.earthlink.net> wrote in message
news:18c7b3c2.0406041125.3cd714a7@.posting.google.c om...
> >> Serving them has no duration, no. And we serve (and record the
> serving) of over 14 million banner ads a day. <<
> Perhaps I do not understand what "serving" means; can you give me a
> scenario. I am a customer; I want to run a banner ad. My banner
> needs to be up from Christmas to New Years day. It needs to run
> between 0600 UTC to 1200 UTC everyday, and it is 5 seconds long. What
> are you recording so that I get the exposure for which I am paying?

Banners don't have a duration. (Well, active content do, but let's come
back to that.).

So, given the criteria you've given, we'd charge you probably (and this
varies but for this we simplify) on number of impressions. I.e the number
of times it's been served.

So an end user goes to a page on our site. The code (generally ASP) goes to
a DB table and queries "what banner should I show." (there may be more than
one scheduled for say the top position on the page). A "coin flip" is made
and the DB hands back a URL to the banner in question. At that point it
records in the database that your banner was served.

Now, the end user may spend 10 seconds at that page or 10 minutes. At that
point we don't really care (and have limited ways of knowing anyway since
the web is generally stateless). You're not paying for that, you're paying
for impressions served.

Now, a standard banner is generally just a gif file, or perhaps an animated
gif. Active content may be fancier, like a flash ad (yuck) or Quicktime,
etc. But again, we don't record any of that, simply the time that the
banner was handed to the user.

This is fairly standard in terms of how banner ads are served. So, no
duration, simply an impression.|||>> Banners don't have a duration. (Well, active content do, but let's
come
back to that.) <<

Isn't that content and its duration what the buyer is paying for?

>> we'd charge you probably on number of impressions. I.e the number
of times it's been served. <<

I understand billing by the number of hits. But if you can put 1000
impressions of my ad in banner in one minute, I am not as happy as I
would be having them spaced out and retained at lest long enough for a
human being to read. When I record the hits, I record them in a time
slot -- you can only hit the banner when it is displayed.

>> So an end user goes to a page on our site. The code (generally
ASP) goes to
a DB table and queries "what banner should I show." A "coin flip" is
made
and the DB hands back a URL to the banner in question. At that point
it
records in the database that your banner was served. Now, the end
user may spend 10 seconds at that page or 10 minutes. <<

At that point, I don't care; the user has left the banner and is in
the target URL. I then have to model his URL behavior in a new set of
tables.

But has happened back at the banner, which is what I was modeling? I
hope the banner was there for a duration greater than zero time units.
When my time slot of duration (t1) was used up, can I assume another
banner got a time slot of (t2) in that banner? You do not "machine
gun" banners so fast that they are not readable.

What you are saying is that "the half of the fact" you see is like a
shipping clerk -- packages only leave in his world view. Likewise a
receiving clerk only sees packages arriving in his world view. But
the whole fact is that package makes a trip that takes time until it
arrives someplace (or is declared lost in transit). The correct model
is global, not local.|||"--CELKO--" <jcelko212@.earthlink.net> wrote in message
news:18c7b3c2.0406051347.6cd6a377@.posting.google.c om...
> >> Banners don't have a duration. (Well, active content do, but let's
> come
> back to that.) <<
> Isn't that content and its duration what the buyer is paying for?

No, since duration can't be measured via the web since it's stateless.

> >> we'd charge you probably on number of impressions. I.e the number
> of times it's been served. <<
> I understand billing by the number of hits. But if you can put 1000
> impressions of my ad in banner in one minute, I am not as happy as I
> would be having them spaced out and retained at lest long enough for a
> human being to read. When I record the hits, I record them in a time
> slot -- you can only hit the banner when it is displayed.

Because that's all we can know.

> But has happened back at the banner, which is what I was modeling? I
> hope the banner was there for a duration greater than zero time units.
> When my time slot of duration (t1) was used up, can I assume another
> banner got a time slot of (t2) in that banner? You do not "machine
> gun" banners so fast that they are not readable.

Banners are delivered as often as the clicks the page. If they go to a
page, read the page, walk away and come back 3 weeks later, the same banner
is still displayed. If they go to a page, quickly see it's not what they
want and click a link to another page, then they'll get a different banner.

You may HOPE the banner was there for duration greater than zero time units,
but generally the web doesn't work that way.

> What you are saying is that "the half of the fact" you see is like a
> shipping clerk -- packages only leave in his world view. Likewise a
> receiving clerk only sees packages arriving in his world view. But
> the whole fact is that package makes a trip that takes time until it
> arrives someplace (or is declared lost in transit). The correct model
> is global, not local.

No it's not. That may be what you want it to be, but that's not the way
banner traffic works.|||Greg D. Moore (Strider) (mooregr_deleteth1s@.greenms.com) writes:
> So an end user goes to a page on our site. The code (generally ASP)
> goes to a DB table and queries "what banner should I show." (there may
> be more than one scheduled for say the top position on the page). A
> "coin flip" is made and the DB hands back a URL to the banner in
> question. At that point it records in the database that your banner was
> served.

But, of course, at my end, I am running a banner-filter proxy, so I never
see the bastard anyway. :-)

--
Erland Sommarskog, SQL Server MVP, esquel@.sommarskog.se

Books Online for SQL Server SP3 at
http://www.microsoft.com/sql/techin.../2000/books.asp|||>> Banners are delivered as often as the clicks the page. If they go
to a page, read the page, walk away and come back 3 weeks later, the
same banner is still displayed. If they go to a page, quickly see
it's not what they want and click a link to another page, then they'll
get a different banner. <<

I would make a big distiction between the banner (the thing that leads
to my Christmas sale) and the image of the banner that has presisted
for weeks after the holidays in the local storage of a particular
machine. My contract was for a duration (Christmas season) and was
with the website that offered to run my banner. They were to display
from one date to another. If it got clicked (n) times between
December 01 and December 25, then I owe them according to some
formula. Maybe if the click leads to sale between December 01 and
December 25, then I owe them according to another formula. But
outside that (possibly open ended) duration, there is no obligation.

Years ago in Los Angeles, I worked on a data model for a cable TV
shopping network for a major department store chain. This was even
worse because each time a commerical played, we had to compute the
actor's residuals, the assorted union pay rates, and how to credit the
purchase to the nearest local store, and the right department within
that store. Arrgh!|||"--CELKO--" <jcelko212@.earthlink.net> wrote in message
news:18c7b3c2.0406061538.50f3cfbf@.posting.google.c om...
> >> Banners are delivered as often as the clicks the page. If they go
> to a page, read the page, walk away and come back 3 weeks later, the
> same banner is still displayed. If they go to a page, quickly see
> it's not what they want and click a link to another page, then they'll
> get a different banner. <<
> I would make a big distiction between the banner (the thing that leads
> to my Christmas sale) and the image of the banner that has presisted
> for weeks after the holidays in the local storage of a particular
> machine.

You might, but that's irrelevant. I'm discussing what the viewer sees on
the screen.

> My contract was for a duration (Christmas season) and was
> with the website that offered to run my banner. They were to display
> from one date to another. If it got clicked (n) times between
> December 01 and December 25, then I owe them according to some
> formula. Maybe if the click leads to sale between December 01 and
> December 25, then I owe them according to another formula. But
> outside that (possibly open ended) duration, there is no obligation.

You're discussing the contract, I'm discussing the serving, those are two
distinct tiems.

Ask them how long each individual banner was displayed on an end-user's
system (the "duration" as you're referring to it.) They can't do it. (and
if they claim they can, they are most likely fudging some of the data).

> Years ago in Los Angeles, I worked on a data model for a cable TV
> shopping network for a major department store chain. This was even
> worse because each time a commerical played, we had to compute the
> actor's residuals, the assorted union pay rates, and how to credit the
> purchase to the nearest local store, and the right department within
> that store. Arrgh!

Years ago I was involved as a sub-contractor (big mistake) on a system for a
major network who shall remain nameless. System was to handle the
scheduling of commercials on the network and had to deal with all sorts of
items such as regional variations within a broadcast (might show snow-tire
commercials up north while showing a vacation commercial down south.) At
that time I wasn't too involved with the schema, but more so the hardware.
It was an interesting situation trying to deal with handling things like
failures and having to predict the required hardware for a reload (forget
the number of transactions that would have to occur in 10 minutes but at the
time, it was a fairly impressive number. Of course the contractor I was
working for kept saying, "Oh, don't worry, the hardware can handle it." I
was the one that kept saying, "no, we have to model this." (generally I've
got enough faith in "gut instinct" I can model some systems in my head, this
was definitely not one of them.)

Anyway, I just thought of a good distinct here.

Whereas things like commercials have a fixed run time, etc. serving banners
is more like blow-ins in the newspaper. You contract for a specific number
over a specific time, but generally don't care about the exact time the
blow-in is blown-in (and can't model when the reader actually reads it or
tosses it in the trash.)

Yes, the contract has a duration which is critical to model (i.e. when to
start serving, stop serving) but the individual serving is only an
"instant."|||"Greg D. Moore (Strider)" <mooregr_deleteth1s@.greenms.com> wrote in message
news:dS8wc.52769$j24.31693@.twister.nyroc.rr.com...
> "--CELKO--" <jcelko212@.earthlink.net> wrote in message
> news:18c7b3c2.0406041125.3cd714a7@.posting.google.c om...
> > >> Serving them has no duration, no. And we serve (and record the
> > serving) of over 14 million banner ads a day. <<

<snip
> Banners don't have a duration. (Well, active content do, but let's come
> back to that.).
> So, given the criteria you've given, we'd charge you probably (and this
> varies but for this we simplify) on number of impressions. I.e the number
> of times it's been served.
> So an end user goes to a page on our site. The code (generally ASP) goes to
> a DB table and queries "what banner should I show." (there may be more than
> one scheduled for say the top position on the page). A "coin flip" is made
> and the DB hands back a URL to the banner in question. At that point it
> records in the database that your banner was served.

Sounds like a Traffic system to me... ;)
We do the same thing for Television advertising. We should talk...

--
Paul Horan
Sr. Architect
Video Communications, Inc.
www.vcisolutions.com|||Joe,
I think what you're missing in this discussion is the distinction between the ORDER for an impression and the audit
trail of the DELIVERY of that impression.

Both Greg and I work in the Advertising "Traffic" business. Our respective software products are basically Order
Fulfillment processes - my company writes Traffic software for television stations, and Greg's company works in the
internet medium.

The attributes of an Order most definitely DO contain "duration" - both a start_date/end_date duration (so that you
don't run Christmas special ads in February - we call those discrete periods of time a "flight"), as well as two columns
for storing the start/end time within which the spot should "air". Some advertisers only want their spots to be seen in
"prime time", for example...

Our TV clients are also concerned with the duration of the spot itself. Is this a regular :30 second spot? a :15? a
28:30 infomercial? Greg's clients don't have that concept - but I'm sure they do have X/Y and width/height parameters.
Once the HTML is rendered and delivered to the browser, that is officially recorded as one "impression" that happened at
a specific nanosecond in time.

We collect the order "parameters" as attributes of the Order entity itself. Then comes the process of matching up
Orders and available "Inventory", and delivering the content. We print out a daily program log so Master Control knows
which commercials to air in what order, and Greg serves up links to banner ads in "real-time". All that's left is the
recording of that delivery, so that the advertisers (or ad agencies) can pay their bills.

--
Paul Horan[TeamSybase]

"--CELKO--" <jcelko212@.earthlink.net> wrote in message news:18c7b3c2.0406061538.50f3cfbf@.posting.google.c om...
> >> Banners are delivered as often as the clicks the page. If they go
> to a page, read the page, walk away and come back 3 weeks later, the
> same banner is still displayed. If they go to a page, quickly see
> it's not what they want and click a link to another page, then they'll
> get a different banner. <<
> I would make a big distiction between the banner (the thing that leads
> to my Christmas sale) and the image of the banner that has presisted
> for weeks after the holidays in the local storage of a particular
> machine. My contract was for a duration (Christmas season) and was
> with the website that offered to run my banner. They were to display
> from one date to another. If it got clicked (n) times between
> December 01 and December 25, then I owe them according to some
> formula. Maybe if the click leads to sale between December 01 and
> December 25, then I owe them according to another formula. But
> outside that (possibly open ended) duration, there is no obligation.
> Years ago in Los Angeles, I worked on a data model for a cable TV
> shopping network for a major department store chain. This was even
> worse because each time a commerical played, we had to compute the
> actor's residuals, the assorted union pay rates, and how to credit the
> purchase to the nearest local store, and the right department within
> that store. Arrgh!sql sql

Thursday, March 29, 2012

Comparing two row values

comparing two fields

Comparing time values

comparing text fields - Second try

comparing text fields - Second try

comparing text fields - Second try

Tuesday, March 27, 2012

comparing text fields - Second try

Comparing Smalldatetime column

Comparing Smalldatetime column

Comparing result set values of 2 queries ?

Comparing result set values of 2 queries ?

Comparing result set values of 2 queries ?

Sunday, March 25, 2012

Comparing multiple values in an iif clause

Comparing Financial values across random dates

Thursday, March 22, 2012

Comparing Dates in Previous and Current Rows

Comparing Dates

Comparing data in two consecutive rows from a single table

Comma Delimited Fields

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