MySQL 5.6 Reference Manual Including MySQL NDB Cluster 7.3-7.4 Reference Guide
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”).