Question

所以我希望在我的查询中添加一个额外的列，根据信用卡/借记卡列计算累积余额。

到目前为止，我的查询看起来像这样：

 SELECT T1.[RefDate], T1.[TransId], T1.[BaseRef], T1.[LineMemo], T3.[Dscription], T1.[Debit], T1.[Credit], T4.[AcctName]
    FROM OJDT T0
    right JOIN JDT1 T1 ON T0.TransId = T1.TransId
    left JOIN OPCH T2 ON T0.TransId = T2.TransId
    left JOIN PCH1 T3 ON T3.DocEntry = T2.DocEntry
    left JOIN OACT T4 ON T1.Account = T4.AcctCode
    WHERE T4.[AcctCode] = [%0] AND
    T1.[RefDate] BETWEEN [%1] AND [%2]

Answer 1

您可以使用窗口SUM：

SELECT T1.[RefDate], T1.[TransId], T1.[BaseRef], T1.[LineMemo], T3.[Dscription], 
    T1.[Debit], T1.[Credit], T4.[AcctName],
    SUM(ISNULL(Debit,0)+ISNULL(Credit,0)) OVER(PARTITION BY ... ORDER BY refDate)
FROM OJDT T0
right JOIN JDT1 T1 ON T0.TransId = T1.TransId
left JOIN OPCH T2 ON T0.TransId = T2.TransId
left JOIN PCH1 T3 ON T3.DocEntry = T2.DocEntry
left JOIN OACT T4 ON T1.Account = T4.AcctCode
WHERE T4.[AcctCode] = [%0] AND
    T1.[RefDate] BETWEEN [%1] AND [%2];

如果Debit列包含正值，则需要在其前面添加-。

Answer 2

OVER周围的文档：https://msdn.microsoft.com/en-us/library/ms189461(v=SQL.110).aspx

您可能会发现示例C最有用，虽然看起来您不想要PARTITION，但是您想要使用RANGE。

对于计算列，您需要这样的内容：

 SUM(ISNULL(Debit,0)+ISNULL(Credit,0)) 
       OVER(RANGE UNBOUNDED PRECEDING AND CURRENT ROW) AS RunningTotal

这将导致查询类似于：

SELECT T1.[RefDate], T1.[TransId], T1.[BaseRef], T1.[LineMemo], T3.[Dscription], T1.[Debit], T1.[Credit], T4.[AcctName],
    SUM(ISNULL(Debit,0)+ISNULL(Credit,0)) 
               OVER(RANGE UNBOUNDED PRECEDING AND CURRENT ROW) AS RunningTotal
            FROM OJDT T0
            right JOIN JDT1 T1 ON T0.TransId = T1.TransId
            left JOIN OPCH T2 ON T0.TransId = T2.TransId
            left JOIN PCH1 T3 ON T3.DocEntry = T2.DocEntry
            left JOIN OACT T4 ON T1.Account = T4.AcctCode
            WHERE T4.[AcctCode] = [%0] AND
            T1.[RefDate] BETWEEN [%1] AND [%2]

累计总数基于两列

2 个答案: