DECLARE @query VARCHAR(2000)
SET @query = '
SELECT
( CASE @@1@@
WHEN 1 THEN ''Sehr gut''
WHEN 2 THEN ''Gut''
WHEN 3 THEN ''Befriedigend''
WHEN 4 THEN ''Ausreichend''
WHEN 5 THEN ''Mangelhaft''
WHEN 6 THEN ''Ungenügend''
END )'
SET @query = replace(@query,'@@1@@','1')
EXEC(@query)