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Date Comparison

Author

Topic

Velnias
Yak Posting Veteran

58 Posts

Posted - 2008-10-29 : 12:24:49

Hey Guys,

I was using the following query to between two dates which was more recent and use this value to determine if the date occured in the last 30 mins.

WHERE (CASE WHEN dateAdded > dateLastModified THEN dateAdded ELSE dateLastModified END >= DATEADD(minute, - 60, GETDATE()))

But however I found If dateLastModified field was empty, it would use dateLastModified and not dateAdded, how can I resolve this around empty fields.

THanks

visakh16
Very Important crosS Applying yaK Herder

52326 Posts

Posted - 2008-10-29 : 12:28:08

[code]WHERE (CASE WHEN dateAdded > dateLastModified OR NULLIF(dateLastModified,'') IS NULL THEN dateAdded ELSE dateLastModified END >= DATEADD(minute, - 60, GETDATE()))[/code]

madhivanan
Premature Yak Congratulator

22864 Posts

Posted - 2008-10-30 : 02:58:10

Avoid using CASE expression in WHERE caluse. You can try

WHERE
(dateAdded > dateLastModified and dateAdded>= DATEADD(minute, - 60, GETDATE()))
or
(dateAdded <= dateLastModified and dateLastModified >= DATEADD(minute, - 60, GETDATE()))

Madhivanan

Failing to plan is Planning to fail

visakh16
Very Important crosS Applying yaK Herder

52326 Posts

Posted - 2008-10-30 : 03:45:57

quote:
Originally posted by madhivanan

Avoid using CASE expression in WHERE caluse. You can try

WHERE
(dateAdded > dateLastModified and dateAdded>= DATEADD(minute, - 60, GETDATE()))
or
(dateAdded <= dateLastModified and dateLastModified >= DATEADD(minute, - 60, GETDATE()))

Madhivanan

Failing to plan is Planning to fail

any special reason for that Madhi?

madhivanan
Premature Yak Congratulator

22864 Posts

Posted - 2008-10-30 : 04:58:26

quote:
Originally posted by visakh16

quote:
Originally posted by madhivanan

Avoid using CASE expression in WHERE caluse. You can try

WHERE
(dateAdded > dateLastModified and dateAdded>= DATEADD(minute, - 60, GETDATE()))
or
(dateAdded <= dateLastModified and dateLastModified >= DATEADD(minute, - 60, GETDATE()))

Madhivanan

Failing to plan is Planning to fail

any special reason for that Madhi?

Performance issue

Madhivanan

Failing to plan is Planning to fail

visakh16
Very Important crosS Applying yaK Herder

52326 Posts

Posted - 2008-10-30 : 05:09:13

Ok...Thanks

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