Mysql触发器使用过程中遇到的问题

[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 ROW
BEGIN
  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

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