Question

I am getting an input in one of my variables and basically I want to do something like

SELECT * FROM PEOPLE
WHERE 
     IF @INPUT = 1
         ITEMID = 16 OR ITEMID = 13
     ELSE IF @INPUT = 2
         ITEMID = 11 OR ITEMID = 14
     ELSE
         ITEMID = 0

Is there a way to do this, please forgive if this is wrong but I wanted to portray my issue as easily understandable as possible.

I tried with CASE before this like

WHERE 
    CASE @INPUT
       WHEN 1 THEN ITEMID = 16 OR ITEMID = 13
       WHEN 2 THEN ITEMID = 11 OR ITEMID = 14
       ELSE ITEMID = 0
    END

But all of these approaches throw errors, I would appreciate a good advise, more efficient way to do this if possible.

Thank you for the help.

Answer 1

 WHERE (@INPUT = 1 AND ITEMID IN (13,16)) 
    OR (@INPUT = 2 AND ITEMID IN (11,14))
    OR (@INPUT NOT IN (1,2) AND ITEMID = 0)