Question

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TSQL- Using CASE in WHERE clause with a < or = sign

How can I use this query in a SQL Server stored procedure?

@VAR1 VARCHAR(2),
AS

SELECT     
    *
FROM         
    TABLE1
WHERE     
    Colum1 = 1
    CASE WHEN @VAR1 = 'OK' THEN 
           AND Colum2 = @Var1
    ELSE
           AND Colum2 IN ('String1','String2')
    END

Thank you very much already now.

Answer 1

As Martin Smith already pointed out in his comment, you can’t use CASE to swap out WHERE clauses.

What you can do is this:

SELECT     
    *
FROM         
    TABLE1
WHERE     
    Colum1 = 1
    AND 
    (
        (@VAR1 = 'OK' and Colum2 = @VAR1)
        OR
        (@VAR1 <> 'OK' and Colum2 IN ('String1','String2'))
    )