Update
mysql> create trigger t2
-> after
-> insert on ord
-> for each row
-> begin update goods set num=num-new.mch where gid = new.gid;
-> end$
Query OK, 0 rows affected (0.02 sec)
mysql> view existing trigger the Trigger
-> ^ C
mysql> Show tigger;
delete:
mysql> create trigger t3 after delete on ord
-> for each row begin update goods set num = num -old.mch where
-> gid = old.gid;end $
Query OK, 0 rows affected (0.02 sec)
mysql> show triggers;
-> $
+---------+--------+-------+-------------------------------------------------------------------+--------+------------------------+-------------------------------------------------------------------------------------------------------------------------------------------+----------------+----------------------+----------------------+--------------------+
| Trigger | Event | Table | Statement | Timing | Created | sql_mode | Definer | character_set_client | collation_connection | Database Collation |
+---------+--------+-------+-------------------------------------------------------------------+--------+------------------------+-------------------------------------------------------------------------------------------------------------------------------------------+----------------+----------------------+----------------------+--------------------+
| t2 | INSERT | ord | begin update goods set num=num-new.mch where gid = new.gid;
end | AFTER | 2019-06-03 07:47:00.22 | ONLY_FULL_GROUP_BY,STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION | root@localhost | utf8 | utf8_general_ci | utf8_general_ci |
| t3 | DELETE | ord | begin update goods set num = num -old.mch where
gid = old.gid;end | AFTER | 2019-06-03 07:57:21.92 | ONLY_FULL_GROUP_BY,STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION | root@localhost | utf8 | utf8_general_ci | utf8_general_ci |
+---------+--------+-------+-------------------------------------------------------------------+--------+------------------------+-------------------------------------------------------------------------------------------------------------------------------------------+----------------+----------------------+----------------------+--------------------+
2 rows in set (0.00 sec)