比較2列和刪除不匹配

Question

$db->query("DELETE FROM probid_auction_media 
WHERE auction_id NOT IN SELECT DISTINCT auction_id FROM probid_auctions"); 

這是我使用的代碼，我希望做的是列auction_id從probid_auction_media從probid_auctions列auction_id比較和刪除從沒有數學任何的人probid_auction_media

Answer 1

您需要括號：

DELETE FROM probid_auction_media 
WHERE auction_id NOT IN 
     (SELECT auction_id FROM probid_auctions) 

Answer 2

你錯過了括號。另外，DISTINCT可能不是必要的：

DELETE FROM probid_auction_media 
    WHERE auction_id NOT IN (SELECT auction_id FROM probid_auction)