錯誤查詢：DELETE和LEFT JOIN

Question

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

我得到這個錯誤：

#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

爲什麼？

Answer 1

您需要指定要從哪個表中刪除。

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

注：更改連接到INNER JOIN因爲你是program.channel_id

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

Answer 2

因爲兩個表所涉及的過濾，你需要說你想從一個表刪除。因此，爲了刪除programSchedule表中的行，你可以這樣做：

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