DELETE FROM不工作的多個表 - 無能與MySQL

Question

基本上，我有三個表

工作場所與字段ID（其中我要刪除相關聯的數據的一個），並且識別參與者一個participantlist_id名單。

participantlist - 只是LIST_ID和名稱

participantlist_links - 與LIST_ID和participant_id

，我試圖使用查詢是這樣的：

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說：

1064 - 你h在您的SQL語法中發生錯誤;檢查對應於您的MySQL服務器版本的手冊，以便在第3行的WHERE workplaces.id ='8'和workplaces.participantlist_id = participant'處使用正確的語法。

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這樣從多個表中刪除：

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

你有沒有考慮把ON DELETE CASCADE的外鍵？ 這種方式從工作區中刪除行時，其他行也會自動刪除。

請參閱此鏈接瞭解更多信息： http://dev.mysql.com/doc/refman/5.5/en/innodb-foreign-key-constraints.html

否則你就必須使用單獨的DELETE FROM查詢，將它們全部刪除。

在執行這些刪除操作時使用事務處理很明智。所以，如果有什麼差錯，你可以回滾所做的更改：

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

Answer 3

嘗試

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語法，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'