php - 比较 2 列并删除不匹配的

Question

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

这是我正在使用的代码，我想做的是将 probid_auction_media 中的auction_id 列与 probid_auctions 中的auction_id 列进行比较，并从 probid_auction_media 中删除任何不是数学的列

score 0 · Accepted Answer

你需要括号：

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

score 0 · Accepted Answer

你缺少括号。此外， aDISTINCT可能不是必需的：

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

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