mysql里怎样创建函数

mysql> select first_func('aaa','bbb','ccc');

+-------------------------------+

| first_func('aaa','bbb','ccc') |

+-------------------------------+

|                             1 |

+-------------------------------+

1 row in set (0.47 sec)

mysql> drop function first_func ;

Query OK, 0 rows affected (0.11 sec)

mysql>show create function function;