DELETE FROM不工作的多个表 - 无能与MySQL

Question

基本上，我有三个表

工作场所与字段ID（其中我要删除相关联的数据的一个），并且识别参与者一个participantlist_id名单。

participantlist - 只是LIST_ID和名称

participantlist_links - 与LIST_ID和participant_id

，我试图使用查询是这样的：

DELETE FROM workplaces, 
participantlist, 
participantlist_links 
WHERE workplaces.id = '8' AND 
     workplaces.participantlist_id = participantlist_links.list_id AND 
     workplaces.participantlist_id = participantlist.list_id 

，但我得到：

MySQL说：

1064 - 你h在您的SQL语法中发生错误;检查对应于您的MySQL服务器版本的手册，以便在第3行的WHERE workplaces.id ='8'和workplaces.participantlist_id = participant'处使用正确的语法。

任何想法？

SOLUTION：

DELETE t1, t2, t3 
    FROM workplaces AS t1 
    LEFT JOIN participantlist AS t2 ON t1.participantlist_id = t2.list_id 
    LEFT JOIN participantlist_links AS t3 ON t2.list_id = t3.list_id 
    WHERE t1.id = '8' 

Answer 1

您可以使用JOIN这样从多个表中删除：

DELETE t1, t2 FROM t1 INNER JOIN t2 INNER JOIN t3 
WHERE t1.id=t2.id AND t2.id=t3.id; 

http://dev.mysql.com/doc/refman/5.5/en/delete.html

Answer 2

你有没有考虑把ON DELETE CASCADE的外键？ 这种方式从工作区中删除行时，其他行也会自动删除。

请参阅此链接了解更多信息： http://dev.mysql.com/doc/refman/5.5/en/innodb-foreign-key-constraints.html

否则你就必须使用单独的DELETE FROM查询，将它们全部删除。

在执行这些删除操作时使用事务处理很明智。所以，如果有什么差错，你可以回滚所做的更改：

BEGIN TRANSACTION; 
DELETE FROM ......; 
DELETE FROM ......; 
COMMIT; 

Answer 3

尝试

DELETE workplaces, participantlist, participantlist_links FROM workplaces, 
participantlist, 
participantlist_links 
WHERE workplaces.id = '8' AND 
     workplaces.participantlist_id = participantlist_links.list_id AND 
     workplaces.participantlist_id = participantlist.list_id 

Answer 4

正如the manual提到的，DELETE的多表的形式有不同的语法，你正在使用的。你想：

DELETE workplaces, participantlist, participant_links 
FROM workplaces 
    JOIN participantlist 
    ON workplaces.participantlist_id = participantlist.list_id 
    JOIN participantlist_links 
    ON workplaces.participantlist_id = participantlist_links.list_id 
WHERE workplaces.id = '8'