使查詢內部查詢結果可選

Question

我想知道是否可以使用MySQL以某種方式包裝內部查詢的選擇，以便外部查詢可以在其where子句中使用它。

SELECT 
`FirstName`, 
`Surname`, 
`AddressLine1`, 
`AddressLine2`, 
`AddressLine3`, 
`AddressLocale`, 
`AddressRegion`, 
`AddressZip`, 
`AddressCountry`, 
`CopyShipAddress` 
FROM `Contacts` 
WHERE `EEID` 
IN 
(SELECT CONCAT_WS(',', `Sender`, `Receiver`, `Buyer`) AS EEID_list 
FROM `Transactions` 
WHERE `TransactionID` = 3) 

Sender，Receiver和Buyer是EEIDs。也許除了CONCAT_WS之外，還有一個功能可以用來提供這種功能。

Answer 1

不使用的IN查詢CONCAT_WS記錄，它可能無法給出正確的數據

CONCAT_WS可以很好地工作的用於查詢與整數，而是因爲他們需要被封閉在可能不是字符串工作引號'

嘗試下面代替

SELECT 
`FirstName`, 
`Surname`, 
`AddressLine1`, 
`AddressLine2`, 
`AddressLine3`, 
`AddressLocale`, 
`AddressRegion`, 
`AddressZip`, 
`AddressCountry`, 
`CopyShipAddress` 
FROM `Contacts` 
WHERE `EEID` 
IN 
(
select Sender as eeid FROM Transactions WHERE TransactionId=3 
UNION ALL 
select Receiver as eeid FROM Transactions WHERE TransactionId=3 
UNION ALL 
select Buyer as eeid FROM Transactions WHERE TransactionId=3 
)