Mysql触发器使用过程中遇到的有关问题

[1054] Unknown column 'xxxxx' in 'where clause'

DROP TRIGGER IF EXISTS `delete_actdata`;CREATE DEFINER=`xxxxxx`@`localhost` TRIGGER `delete_actdata`BEFORE DELETE ON `actdata`FOR EACH ROWBEGIN  DELETE FROM `great` WHERE `great`.`actid`=`actid`;  DELETE FROM `join` WHERE `join`.`actid`=`actid`;  DELETE FROM `get` WHERE `get`.`actid`=`actid`;  DELETE FROM `signup` WHERE `signup`.`actid`=`actid`;  DELETE FROM `vote_option` WHERE `vote_option`.`actid`=`actid`;  DELETE FROM `vote_users` WHERE `vote_users`.`actid`=`actid`;END;

删除的每个表中的字段名称要与触发器所在表的字段名一致