Question

I ve following simple case statement

 CASE WHEN @SPOID is not null THEN 
            (176)
       ELSE
            (SELECT designationID from setupdesignations where reportto = 99)
       END

When else clause of this statement execute it gives me the following error

Subquery returned more than 1 value. This is not permitted when the subquery follows =, !=, <, <= , >, >= or when the subquery is used as an expression.

I am using this statement in the IN clause I was expecting multiple result to be returned in else case but it is giving me the above error. If I remove the case statement and execute the else part in query then i get the expected result

Answer 1

You can’t use a subselect as an expression within a CASE match, it expects a single value. Instead how about;

where 
  (@SPOID is not null and infield = 176)
or
  (@SPOID is null and infield in (SELECT designationID from setupdesignations where reportto = 99))