用於生成金融交易彙總報告的SQL

Question

我有一個類似上圖的交易表。現在，我要生成一個總結報告如下：

會是怎樣寫的SQL的最佳方法？

請幫忙。在此先感謝:)

Answer 1

另一種方式來獲得相同的結果，但沒有額外的分組：

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 

檢查SQLFiddle

---

和多一個選擇 - 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 

檢查SQLFiddle

Answer 2

實現報告有很多方法。我用過Common table表達式。 您也可以修改查詢並使用連接。

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