用于生成金融交易汇总报告的SQL

Question

我有一个类似上图的交易表。现在，我要生成一个总结报告如下：

会是怎样写的SQL的最佳方法？

请帮忙。在此先感谢:)

Answer 1

另一种方式来获得相同的结果，但没有额外的分组：

WITH base AS 
(
    SELECT Debtor_Acc As Account_NO, Amount*-1 as Amount FROM transaction 
    UNION ALL 
    SELECT Creditor_Acc, Amount FROM transaction 
) 
SELECT Account_NO, SUM(Amount) Amount 
FROM base 
GROUP BY Account_NO 

检查SQLFiddle

---

和多一个选择 - 不使用CTE：

SELECT Account_NO, SUM(Amount) Amount 
FROM 
(
    SELECT Debtor_Acc As Account_NO, Amount*-1 as Amount FROM transaction 
    UNION ALL 
    SELECT Creditor_Acc, Amount FROM transaction 
) 
GROUP BY Account_NO 

检查SQLFiddle

Answer 2

实现报告有很多方法。我用过Common table表达式。 您也可以修改查询并使用连接。

WITH CTE (Account_NO,Amount) 
AS 
(
SELECT Debtor_Acc As Account_NO,-SUM(Amount) Amount 
FROM transaction GROUP BY Debtor_Acc 
UNION 
SELECT Creditor_Acc,SUM(Amount) 
FROM transaction GROUP BY Creditor_Acc 
) 
SELECT Account_NO,SUM(Amount) FROM CTE 
GROUP BY Account_NO