Question

以下是我的查询和按交易类型C分组为Credit，D为借方和

SELECT 
case 
WHEN ACT.TRANSACTIONTYPE='C' THEN SUM(ACT.AMOUNT) END AS CreditBalance,
case 
WHEN ACT.TRANSACTIONTYPE='D' THEN SUM(ACT.AMOUNT) END AS DebitBalance
FROM accounttransaction ACT 
WHERE ACT.TRANSACTIONTYPE IS NOT NULL
GROUP BY ACT.TRANSACTIONTYPE;

以下是我的结果

CreditBalance DebitBalance
16536          NULL
NULL           9673

现在我要减去A / C的余额然后我需要显示为当前余额帐户交易表包括帐户号，交易类型和金额

Answer 1

您按TransactionType进行分组，因此结果显示在不同的行上。您需要删除group by并移动条件表达式 sum()：

select sum(case when  ACT.TRANSACTIONTYPE = 'C' then act.amount end) as CreditBalance,
       sum(case when  ACT.TRANSACTIONTYPE = 'D' then act.amount end) as DebitBalance
from AccountTransaction act
WHERE act.TRANSACTIONTYPE IS NOT NULL;

Answer 2

您是否只想要所有信用卡/借记卡金额的总额？

如果可能如下： -

SELECT Accountnumber, SUM(CASE WHEN transactiontype = 'C' THEN amount ELSE -1 * amount END) 
FROM accounttransaction
WHERE transactiontype IS NOT NULL
GROUP BY Accountnumber

或者单独提供信用卡和借记金额以及总计

SELECT Accountnumber, 
    SUM(CASE WHEN transactiontype = 'C' THEN amount ELSE 0 END) AS CreditTotal,
    SUM(CASE WHEN transactiontype = 'D' THEN amount ELSE 0 END) AS DebitTotal,
    SUM(CASE WHEN transactiontype = 'C' THEN amount WHEN transactiontype = 'D' THEN -1 * amount ELSE 0 END) AS OverallTotal
FROM accounttransaction
WHERE transactiontype IS NOT NULL
GROUP BY Accountnumber

无法在Mysql选择查询中使用Case语句？

2 个答案: