CASE WHEN in Where Clause

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Dear Everbody,

How can I use CASE WHEN in WHERE Clause Please find my below query::

SQL

SELECT C.*
FROM COM C
LEFT OUTER JOIN ROSTER R ON R.EMPID = C.EMPID
LEFT OUTER JOIN USER U ON U.EMPID = R.EMPID
WHERE TID = (CASE WHEN C.TID IS NULL OR C.TID = '' THEN C.TTID
             WHEN R.TID IS NULL THEN U.TID ELSE R.TID END)

How can I achieve this.? Is it possible like this.?

Posted 8-Aug-15 21:45pm

tpkpradeep

Updated 10-Aug-15 11:26am

Maciej Los

v2

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[no name] 10-Aug-15 4:40am

If you provide more information about what kind of data you need to fetch and why you require case in where clause
then may be some one helps

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OriginalGriff · Answer 1 · 2015-08-08T22:20:00

Solution 1

Probably, you need to clarify which TID value you are trying to access.

SQL

WHERE TID = (CASE WHEN ...

Doesn't specify, but the rest of the code:

SQL

C.TID IS NULL ...  WHEN R.TID IS NULL ...

Shows two values with the same name in different tables.
I'm just guessing you want

SQL

WHERE U.TID = (CASE WHEN ...

Posted 8-Aug-15 22:20pm

OriginalGriff

Comments

tpkpradeep 10-Aug-15 6:19am

DECLARE @TID CHAR(2)
SET @TID = 'ON'

WHERE @TID = (CASE WHEN C.TID IS NULL OR C.TID = '' THEN C.TTID
WHEN R.TID IS NULL THEN U.TID ELSE R.TID END)

Sorry I forgot to add the above.