If we have ALTER ROUTINE privileges then with the help of DROP FUNCTION statement, we can delete a MySQL stored function. Its syntax can be as follows −
DROP FUNCTION [IF EXISTS] function_name
Here function_name is the name of the function which we want to delete from our database.
mysql> DROP FUNCTION if exists Hello1; Query OK, 0 rows affected (0.70 sec)
Now after deleting the function, check for the CREATE FUNCTION statement and we will get the error as follows −
mysql> SHOW CREATE FUNCTION Hello1; ERROR 1305 (42000): Function Hello1 does not exist.