What to do in case multiple conditions?

284    Asked by alexGONZALEZ in SQL Server , Asked on Sep 30, 2022

I need to change returned value, from select statement, based on several conditions. I tried something like that:

,CASE i.DocValue
  WHEN 'F2' AND c.CondCode IN ('ZPR0','ZT10','Z305') THEN c.CondVal
  ELSE 0
END as Value

Why is it not working and what is the recommended way to do this ? There will be next several WHEN conditions.

Answered by Amit raj

In case multiple conditions -


,CASE WHEN i.DocValue ='F2' AND c.CondCode IN ('ZPR0','ZT10','Z305') THEN c.CondVal
  ELSE 0
END as Value
There are two types of CASE statements, SIMPLE and SEARCHED.
You cannot evaluate multiple expressions in a Simple case expression, which is what you were attempting to do.
-- Simple CASE expression:
CASE input_expression
     WHEN when_expression THEN result_expression [ ...n ]
     [ ELSE else_result_expression ]
END
-- Searched CASE expression:
CASE
     WHEN Boolean_expression THEN result_expression [ ...n ]
     [ ELSE else_result_expression ]
END
Example of Simple CASE:
CASE x
  WHEN 'a' THEN 'b'
  WHEN 'c' THEN 'd'
  ELSE 'z'
END
Example of a Searched CASE:
CASE
  WHEN x = 1 AND y = 2 THEN 'a'
  WHEN x = 2 AND y = 1 THEN 'b'
  ELSE 'z'
END

Further Reading: http://msdn.microsoft.com/en-us/library/ms181765.aspx



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