SQL从连接表中删除不起作用

Question

以下是返回语法错误问题。 在线搜索后，我看不出原因。有什么想法吗？

delete Tracks                                                                                                                                                     
from tracks                                                                                                                                                                      
left join releases                                                                                                                                                               
on tracks.label_id=releases.label_id                                                                                                                                             
where tracks.label_id = 185 
and releases.id = 4394 
and tracks.position = 1 
and tracks.name != 'Da Antidote';

语法错误在第1行。

Answer 1

如果我没记错，Postgres不允许在DELETE中加入，但您可以使用USING关键字代替described in the documentation：

DELETE FROM Tracks 
USING releases  
WHERE tracks.label_id=releases.label_id  
AND tracks.label_id = 185 
AND releases.id = 4394 
AND tracks.position = 1 
AND tracks.name != 'Da Antidote';

Answer 2

delete from tracks                                                                                                                                                                      
left join releases                                                                                                                                                               
on tracks.label_id=releases.label_id                                                                                                                                             
where tracks.label_id = 185 
and releases.id = 4394 
and tracks.position = 1 
and tracks.name != 'Da Antidote';

Answer 3

您可以使用EXISTS条款：

DELETE FROM tracks t1 WHERE EXISTS (
    SELECT 1 FROM releases t2 WHERE 
        t1.label_id = t2.label_id
        AND yadda, yadda, yadda
);