MySQL：将值检索到不同的列中

Posted 2023-02-24

【中文标题】MySQL：将值检索到不同的列中

【英文标题】：MySQL: Retrieving values into different columns

【发布时间】：2015-02-13 07:48:08

【问题描述】：

请看下面的代码。

SELECT Transactions.`idTransactions`,
Transactions.`Transaction_TimeStamp`,
Transactions.`idPortfolio`,
CASE  when Transactions.`Transaction_Amount`< 0  THEN END AS "Encashments"  ELSE END AS "Additions" ,
Portfolio.Activation 
FROM Transactions 
INNER JOIN Portfolio ON Transactions.idPortfolio = Portfolio.idPortfolio 
WHERE Transactions.idPortfolio=1
ORDER BY `Transaction_TimeStamp` DESC

这里，如果Transactions.Transaction_Amount >0，那么我需要在“Additions”列中显示该值，否则在“Encashment”列中显示。但是我的代码产生如下错误。

#1064 - You have an error in your SQL syntax; check the manual that corresponds to your mysql server version for the right syntax to use near 'AS "Encashments"  ELSE END AS "Additions" ,
Portfolio.Activation 
FROM Transacti' at line 4 

请问我该如何解决这个问题？

【参考方案1】：

如果您想要 2 个不同的列，则使用两种情况

SELECT Transactions.`idTransactions`,
       Transactions.`Transaction_TimeStamp`,
       Transactions.`idPortfolio`,
       CASE when Transactions.`Transaction_Amount` <= 0 
            THEN  (Transaction_Amount*-1)
       END AS Encashments,
       CASE when Transactions.`Transaction_Amount` > 0 
            THEN Transaction_Amount
       END AS Additions,
       Portfolio.Activation 
FROM Transactions 
INNER JOIN Portfolio ON Transactions.idPortfolio = Portfolio.idPortfolio 
WHERE Transactions.idPortfolio=1
ORDER BY `Transaction_TimeStamp` DESC

【讨论】：

我遇到错误，你能合并完整的代码吗？

abs(Transaction_Amount) 或只是 Transaction_Amount*-1

感谢您的帮助，非常感谢。

您好，代码有问题。它将兑现显示为加法，反之亦然...

然后互换名称

【参考方案2】：

您应该将 SQL 用作：

SELECT Transactions.`idTransactions`,
Transactions.`Transaction_TimeStamp`,
Transactions.`idPortfolio`,
CASE  when Transactions.`Transaction_Amount`< 0  THEN "Encashments"  ELSE "Additions" END AS Type,
Portfolio.Activation 
FROM Transactions 
INNER JOIN Portfolio ON Transactions.idPortfolio = Portfolio.idPortfolio 
WHERE Transactions.idPortfolio=1
ORDER BY `Transaction_TimeStamp` DESC

then 语法错误的情况。你可以参考here

【参考方案3】：

你的案子没有结果。

CASE  when Transactions.`Transaction_Amount`< 0  THEN something_missing_here END AS