mysql - 每个派生表都必须有自己的别名

Question

我有以下查询:

SELECT `snap`.`ID`, `user`.`username`, `vote`.`type` 
FROM (`snap`) JOIN `user` as u ON `u`.`ID` = `snap`.`user` 
LEFT JOIN (select * from vote where user = "18") as vote ON `snap`.`ID` = `vote`.`snap` 
JOIN (SELECT CEIL(MAX(ID)*RAND()) AS ID FROM snap)) AS x ON `snap`.`ID` => `x`.`ID` 
WHERE `snap`.`active` = 0 LIMIT 1

在我添加最后一个 JOIN 之前它工作得很好。现在我收到错误:“每个派生表都必须有自己的别名”。我知道这是因为每个表都需要它的别名，我需要在某个地方放置“as S”或其他东西，但我无法在此查询中找到如何做到这一点。

Answer 1

好像你在 snap 之后有额外的右括号。它应该是 1 个而不是 2 个右括号。

SELECT `snap`.`ID`, `user`.`username`, `vote`.`type` 
FROM (`snap`) JOIN `user` as u ON `u`.`ID` = `snap`.`user` 
LEFT JOIN (select * from vote where user = "18") as vote ON `snap`.`ID` = `vote`.`snap` 
JOIN (SELECT CEIL(MAX(ID)*RAND()) AS ID FROM snap) AS x ON `snap`.`ID` = `x`.`ID` 
WHERE `snap`.`active` = 0 LIMIT 1