Case in where clause

Question

SELECT * FROM CTE WHERE CREATION_DATE BETWEEN @StartDate AND @EndDate

in the above query i need to write a case statement in where clause for the below conditions

if @show =0 then ISNULL(COST_TOTAL,0) + ISNULL(REV_TOTAL,0) = 0 
else @show =1 then R_TOTAL <= 5000 AND  ISNULL(C_TOTAL,0) + ISNULL(R_TOTAL,0) > 0

pleas do the needful

Answer 1

0

You cannot use a case statement in the where clause to select which conditional is evaluated. You can however achieve something similar with OR. For instance:

(@show =0 AND ISNULL(COST_TOTAL,0) + ISNULL(REV_TOTAL,0) = 0) OR 
(@show =1 AND R_TOTAL <= 5000 AND  ISNULL(C_TOTAL,0) + ISNULL(R_TOTAL,0) > 0)

Alternatively, you could use dynamic SQL to include just the appropriate condition as you build the query.

[Edited for clarity based on helpful comments.]

answered Aug 10 '12 at 03:51 PM

TimothyAWiseman
14.3k ● 16 ● 20 ● 29

Thank you very much

Aug 10 '12 at 04:12 PM Mohan

@TimothyAWiseman: "You cannot use a case statement in the where clause." Of course you can! Something like:

SELECT
 objects.name
   ,objects.object_id
   ,objects.principal_id
   ,objects.schema_id
   ,objects.parent_object_id
   ,objects.type
   ,objects.type_desc
 FROM
 SYS.objects
 WHERE
 objects.type = CASE
 WHEN objects.type_desc = N'SYSTEM_TABLE' THEN
 N'S'
 ELSE
 NULL
 END

Aug 13 '12 at 08:10 AM eghetto

@eghetto You are right of course. I was not at all clear and I meant you can't use a case statement the way Murali was trying. You can't use it to directly select which conditional statement is evaluated.

Aug 15 '12 at 04:19 PM TimothyAWiseman

@eghetto I updated it, thank you for helping me clarify.

Aug 15 '12 at 04:20 PM TimothyAWiseman

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Case in where clause

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