Documentation for the DROP FUNCTION statement, which uninstalls a UDF and removes its entry from the system table.
DROP FUNCTION [IF EXISTS] function_nameThis statement drops the user-defined function (UDF) named function_name.
To drop a function, you must have the for the mysql database. This is because DROP FUNCTION removes the row from the system table that records the function's name, type and shared library name.
For dropping a stored function, see .
To upgrade the UDF's shared library, first run a 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.
IF EXISTS:
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DROP FUNCTION jsoncontains_path;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 |
+-------+------+------------------------------------------------+