Msg 8133, Level 16, State 1, Line 2
None of the result expressions in a CASE specification can be NULL.
This error message appears when one result expression in a CASE expression is NULL.
The T-SQL statement can be parsed, but causes the error at runtime.
Errors of the Severity Level 16 are generated by the user and can be fixed by the SQL Server user. The statement cannot be executed this way. You must modify the CASE expression so that no result expression can be NULL.
All versions of SQL Server.
IF OBJECT_ID(‘tempdb..#t’) > 0
DROP TABLE #t
CREATE TABLE #t
id INT NOT NULL IDENTITY
INSERT INTO #t DEFAULT VALUES;
SELECT CASE WHEN NULL IS NULL THEN NULL ELSE NULL END
In the above example we try to use a CASE expression in which both the THEN and the ELSE part return NULL. This raises the error.