使用 1 個查詢從三個不同的表中刪除？

Question

是否可以將這三個查詢合二為一？

DELETE FROM `users exercises` WHERE `date` = '$date' AND `userid` = '$user->id'
DELETE FROM `users foods` WHERE `date` = '$date' AND `userid` = '$user->id'
DELETE FROM `users check-ins` WHERE `date` = '$date' AND `userid` = '$user->id'

Answer 1

如果可以加入多個表，則可以從多個表中刪除。 在你的情況下確實如此。 嘗試

DELETE e, f, c
FROM `users exercises` e
inner join `users foods` f on f.userid = e.userid and f.`date` = e.`date`
inner join `users check-ins` c on c.userid = e.userid and c.`date` = e.`date`
WHERE e.`date` = '$date' 
AND e.userid = '$user->id'