SQL從連接表中刪除不起作用

Question

以下是返回語法錯誤問題。 在網上徹底搜索後，我看不出爲什麼。有任何想法嗎？

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'; 

語法錯誤是1號線。

Answer 1

如果我沒有記錯的Postgres不允許加入在DELETE，但你可以使用關鍵字USING，而不是像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子句：

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