错误查询：DELETE和LEFT JOIN

Question

DELETE FROM programSchedule 
LEFT JOIN program ON programSchedule.pid = program.id 
WHERE program.channel_id = 10 

我得到这个错误：

#1064 - You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'LEFT JOIN program ON programSchedule.pid = program.id' at line 1

为什么？

Answer 1

您需要指定要从哪个表中删除。

DELETE programSchedule.* 
FROM programSchedule LEFT JOIN program ON programSchedule.pid = program.id 
WHERE program.channel_id = 10 

注：更改连接到INNER JOIN因为你是program.channel_id

DELETE programSchedule.* 
FROM programSchedule INNER JOIN program ON programSchedule.pid = program.id 
WHERE program.channel_id = 10 

Answer 2

因为两个表所涉及的过滤，你需要说你想从一个表删除。因此，为了删除programSchedule表中的行，你可以这样做：

DELETE programSchedule.* 
FROM programSchedule 
LEFT JOIN program ON programSchedule.pid = program.id 
WHERE program.channel_id = 10