Case in Where Clause - SQL Server Forums

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Case in Where Clause

Author

Topic

acko
Yak Posting Veteran

52 Posts

Posted - 2003-06-22 : 15:02:13

Hi everybody
Can I use case statement in WHERE clause.
For example

DECLARE @VAR1 nvarchar(50)
DECLARE @VAR2 int
SELECT * FROM ORDERS
WHERE CASE @VAR1
WHEN 'Customers' THEN CustomerID = @VAR2
WHEN 'Employee' THEN EmployeeID = @VAR2
END

This is not working OK.
Can someone explain me the right way?
Thanks.
Best regards
Alex

robvolk
Most Valuable Yak

15732 Posts

Posted - 2003-06-22 : 15:16:17

CASE does not control the flow of execution (as it does in VB), it returns a value like a function does. Therefore, CASE will not work unless it has an equal sign directly to its left.

DECLARE @VAR1 varchar(50), @VAR2 int
SELECT * FROM ORDERS
WHERE CustomerID = CASE @VAR1 WHEN 'Customers' THEN @VAR2 ELSE CustomerID END
AND EmployeeID = CASE @VAR1 WHEN 'Employee' THEN @VAR2 ELSE EmployeeID END

acko
Yak Posting Veteran

52 Posts

Posted - 2003-06-23 : 09:33:04

Thanks very much

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