DROP FUNCTION

Grammar description

The DROP FUNCTION statement represents the deletion of a user-defined function.

Grammar structure

> DROP FUNCTION <name> ([<arg_data_type> ]… )

Examples

Example 1

--Removing Parametric Functions

create or replace function py_add(a int, b int) returns int language python as 
$$
def add(a, b):
  return a + b
$$
handler 'add';

mysql> select py_add(1,2);
+--------------+
| py_add(1, 2) |
+--------------+
|            3 |
+--------------+
1 row in set (0.01 sec)

--When we no longer need the function, we can remove it
drop function py_add(int, int);

Example 2

--Deleting Unreferenced Functions
mysql> CREATE FUNCTION t1_fun () RETURNS VARCHAR LANGUAGE SQL AS 'select n1 from t1 limit 1' ;
Query OK, 0 rows affected (0.01 sec)

mysql> drop function t1_fun();
Query OK, 0 rows affected (0.01 sec)