SQL use CASE statement in WHERE IN clause

Question

Can you use a case statement in a where clause? Possibly like this:

 DECLARE @Status VARCHAR(50);
 SET @Status='published';

 SELECT * FROM Product P    
 WHERE P.Status IN (CASE WHEN @Status='published' THEN (1,3)
                                   WHEN @Status='standby' THEN (2,5,9,6)
                                   WHEN @Status='deleted' THEN (4,5,8,10)
                                   ELSE (1,3)
                                   END)

This code gives the error : Incorrect syntax near ','.

Answer 1

You cannot use case and in in this manner. nonetheless, you can:

SELECT * FROM Product P    
WHERE @Status='published' and P.Status IN (1,3)
or @Status='standby' and P.Status IN  (2,5,9,6)
or @Status='deleted' and P.Status IN (4,5,8,10)
or P.Status IN (1,3)

BTW you can reduce that to:

SELECT * FROM Product P    
WHERE @Status='standby' and P.Status IN (2,5,9,6)
or @Status='deleted' and P.Status IN (4,5,8,10)
or P.Status IN (1,3)

Since or P.Status IN (1,3) gives you also all records of @Status='published' and P.Status IN (1,3).

I hope this helps you.