Syntax
------ 
DROP FUNCTION [IF EXISTS] function_name
 
Description
----------- 
This statement drops the user-defined function (UDF) named
function_name.
 
To drop a function, you must have the DELETE privilege for
the mysql database. This is because DROP FUNCTION removes
the row from the mysql.func system table that records the
function's name, type and shared library name.
 
For dropping a stored function, see DROP FUNCTION.
 
Upgrading a UDF
 
To upgrade the UDF's shared library, first run a DROP
FUNCTION statement, then upgrade the shared library and
finally run the CREATE FUNCTION statement. If you upgrade
without following this process, you may crash the server.
 
Examples
-------- 
DROP FUNCTION jsoncontains_path;
 
IF EXISTS:
 
DROP FUNCTION jsoncontains_path;
 
ERROR 1305 (42000): FUNCTION test.jsoncontains_path does not
exist
 
DROP FUNCTION IF EXISTS jsoncontains_path;
 
Query OK, 0 rows affected, 1 warning (0.00 sec)
 
SHOW WARNINGS;
 
+-------+------+------------------------------------------------+
| Level | Code | Message |
+-------+------+------------------------------------------------+
| Note | 1305 | FUNCTION test.jsoncontains_path does not
exist |
+-------+------+------------------------------------------------+
 

 
 
 
 
 
 
 

URL: https://mariadb.com/kb/en/drop-function-udf/