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MySQL 5.6 Reference Manual  /  ...  /  DROP PROCEDURE and DROP FUNCTION Statements

13.1.26 DROP PROCEDURE and DROP FUNCTION Statements

DROP {PROCEDURE | FUNCTION} [IF EXISTS] sp_name

These statements are used to drop a stored routine (a stored procedure or function). That is, the specified routine is removed from the server. (DROP FUNCTION is also used to drop user-defined functions; see Section 13.7.3.2, “DROP FUNCTION Statement for User-Defined Functions”.)

To drop a stored routine, you must have the ALTER ROUTINE privilege for it. (If the automatic_sp_privileges system variable is enabled, that privilege and EXECUTE are granted automatically to the routine creator when the routine is created and dropped from the creator when the routine is dropped. See Section 20.2.2, “Stored Routines and MySQL Privileges”.)

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

DROP FUNCTION is also used to drop user-defined functions (see Section 13.7.3.2, “DROP FUNCTION Statement for User-Defined Functions”).