Question

我突然面对这个问题。我想将数据传递给Subquery，但它显示出一些错误。有我的代码。

SELECT transaction.TrnID as NeedTopass
FROM transaction
WHERE `Creditor` = '130' AND
(SELECT meta.MetaValue FROM meta WHERE meta.Parent = NeedTopass) = '505'

但是它显示了这个错误。

未知专栏＆＃39; NeedTopass＆＃39;在＆＃39; where子句＆＃39;

Answer 1

加入是你的朋友：

注意：您只需引用字符串。如果'505'是一个不必要的数字

SELECT transaction.TrnID as NeedTopass
FROM transaction t
LEFT join meta m ON m.Parent = t.TrnID
WHERE `Creditor` = '130'
AND m.MetaValue = '505';

Answer 2

USE``交易前的这个符号

SELECT `transaction`.`TrnID`,`meta`.`MetaValue`
FROM `transaction` LEFT JOIN `meta` ON(`meta`.`Parent`=`transaction`.`TrnID`)
WHERE `Creditor` = '130' AND `meta`.`MetaValue`='505'

SQL子查询传递数据

2 个答案: