SQL子查詢傳遞數據

Question

突然間我面臨這個問題。我想將數據傳遞給子查詢，但它顯示一些錯誤。有我的代碼。

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

但它顯示此錯誤。

在 'where子句'

Answer 1

連接是你的朋友未知列 'NeedTopass'：

注：您只需引用字符串。如果 '505' 的一些公司沒有必要

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

使用``交易

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