SQL CASE and local variables

Question

I would like to know how I can use local variables in CASE statements in SQL?

This script gives me an error:

    DECLARE @Test int;
    DECLARE @Result char(10);
    SET @Test = 10;

    CASE @Test
    WHEN @Test = 10
    THEN SET @Result='OK test'
    END
    Print @Result;

I use MS SQL 2008.

Solution 1

Two ways to use CASE in this scenario with MSSQL

DECLARE 
    @test   int,
    @result char(10)

SET @test = 10

SET @result = CASE @test
    WHEN 10 THEN 
        'OK test'
    ELSE
        'Test is not OK'
END

PRINT @result;

SET @result = CASE 
    WHEN @test = 10 THEN 
        'OK test'
    ELSE
        'Test is not OK'
END

PRINT @result

Solution 2

try this:

DECLARE @Test int;
DECLARE @Result char(10);
SET @Test = 10;

select @Result=
CASE @Test
WHEN 10 THEN  'OK test'
END

Print @Result;

Solution 3

In SQL Server I would write it like this:

DECLARE @Test int;
DECLARE @Result char(10);
SET @Test = 10;

SET @Result = CASE @Test
WHEN 10
 THEN 'OK test'
END
Print @Result;

The WHEN clause does not have @Test = 10, as the @Test variable is stated in the CASE clause.

See the CASE documentation for SQL Server.

Comments

[Tobiasopdenbrouw]

This does not work in my SQL 2005 db. (incorrect syntax near the keyword 'Case'). (I had the same solution, but it didn't work).

[Evil Pigeon]

The syntax here is wrong. You can't use a case statement like an if statement.

[Tobiasopdenbrouw]

anishmarokey's answer is a bit cleaner as it retains your @result variable.