Syntax

DROP FUNCTION [IF EXISTS] f_name

Description

The DROP FUNCTION statement is used to drop a stored function or a user-defined function (UDF). That is, the specified routine is removed from the server, along with all privileges specific to the function. You must have the ALTER ROUTINE privilege for the routine in order to drop it. If the automatic_sp_privileges server system variable is set, both the ALTER ROUTINE and EXECUTE privileges are granted automatically to the routine creator - see Stored Routine Privileges.

IF EXISTS

The IF EXISTS clause is a MySQL/MariaDB extension. It prevents an error from occurring if the function does not exist. A NOTE is produced that can be viewed with SHOW WARNINGS.

For dropping a user-defined functions (UDF), see DROP FUNCTION UDF.

Examples

DROP FUNCTION hello;
Query OK, 0 rows affected (0.042 sec)

DROP FUNCTION hello;
ERROR 1305 (42000): FUNCTION test.hello does not exist

DROP FUNCTION IF EXISTS hello;
Query OK, 0 rows affected, 1 warning (0.000 sec)

SHOW WARNINGS;
+-------+------+------------------------------------+
| Level | Code | Message                            |
+-------+------+------------------------------------+
| Note  | 1305 | FUNCTION test.hello does not exist |
+-------+------+------------------------------------+

See Also

• DROP PROCEDURE
• Stored Function Overview
• CREATE FUNCTION
• CREATE FUNCTION UDF
• ALTER FUNCTION
• SHOW CREATE FUNCTION
• SHOW FUNCTION STATUS
• Stored Routine Privileges
• INFORMATION_SCHEMA ROUTINES Table