如何将条件和聚合列添加到依赖于前面行的SQL查询中？

假设我有下表

|Id|Debtor|Creditor|
| 0|0     |400     |
| 1|1000  |0       |
| 2|2000  |0       |
| 3|0     |5000    |

我需要在每一行上添加两列

TotalDebt

和

TotalCredit

，条件是在一行中只有一个总计被填充，另一个为零。 这是我要查找的查询结果

|Id|Debtor|Creditor|TotalDebt|TotalCredit|
| 0|0     |400     |0        |400        |
| 1|1000  |0       |600      |0          |
| 2|2000  |0       |2600     |0          |
| 3|0     |5000    |0        |2400       |

试试这个：

SELECT Id, Debtor, Creditor, 
       IIF(Debtor=0, 0, SUM(Debtor-Creditor) OVER (ORDER BY Id)) AS TotalDebt,
       IIF(Creditor=0, 0, SUM(Creditor-DEbtor) OVER (ORDER BY Id)) AS TotalCredit
FROM mytable

试试：

SELECT *,
       case when [Debtor]> 0 then sum([Debtor] - [Creditor] ) over (order by id) 
            else 0 end as TotalDebt,
       case when [Creditor]> 0 then sum([Creditor] - [Debtor]) over (order by id) 
            else 0 end as TotalCredit
FROM table1

---

演示：

这里有一种方法：

创建并填充样本数据（请在以后的问题中保存此步骤）

将cte用于债务人和债权人列的滚动总和：

;WITH CTE AS
(
    SELECT  id, 
            Debtor, 
            Creditor, 
            SUM(Creditor - Debtor) OVER(ORDER BY ID) As RollingSum
    FROM @T
)

从cte中选择：

SELECT  Id,
        Debtor,
        Creditor,
        IIF(RollingSum < 0, -RollingSum, 0) As TotalDebt,
        IIF(RollingSum > 0, RollingSum, 0) As TotalCredit
FROM CTE

---

使用子查询进行计算低于或等于给定“Id”的所有条目的总和

如果您不想使用IIF（这是特定于版本的），请尝试下面的查询这将为您提供准确的所需输出：

DECLARE @TableData AS TABLE(id int,Debtor int,Creditor int)

INSERT INTO @TableData VALUES
(0, 0, 400 ),
(1, 1000, 0),
(2, 2000, 0),
(3, 0, 5000),
(4, 10, 0),
(5, 0, 20)

;WITH SAMPLEDATA
AS
(
    SELECT *,0 TD,Creditor TC FROM @TableData WHERE ID=0
    UNION ALL
    SELECT T2.*,
    CASE WHEN T2.Debtor=0 THEN 0 ELSE T1.TD+(T2.Debtor-T1.Creditor) END,
    CASE WHEN T2.Creditor=0 THEN 0 ELSE T2.Creditor-T1.TD END
     FROM SAMPLEDATA T1 JOIN @TableData T2 ON T1.id=T2.id-1 
)
select * from SAMPLEDATA

查询的输出，带有一些附加的虚拟数据：

---------------------------------
id  Debtor  Creditor    TD  TC
---------------------------------
0   0       400     0       400
1   1000    0       600     0
2   2000    0       2600    0
3   0       5000    0       2400
4   10      0       -4990   0
5   0       20      0       5010
---------------------------------

---

如果添加此行：

4100,0

？您的结果将在

TotalDebt

列中显示

-2300

，在

TotalCredit

列中显示

0

@ZoharPeled我认为这是OP真正想要的。好吧，总债务-2300实际上就是总信用2300，这就是我的建议所显示的。我想我们必须等待OP的回应。

DECLARE @TableData AS TABLE(id int,Debtor int,Creditor int)

INSERT INTO @TableData VALUES
(0, 0, 400 ),
(1, 1000, 0),
(2, 2000, 0),
(3, 0, 5000),
(4, 10, 0),
(5, 0, 20)

;WITH SAMPLEDATA
AS
(
    SELECT *,0 TD,Creditor TC FROM @TableData WHERE ID=0
    UNION ALL
    SELECT T2.*,
    CASE WHEN T2.Debtor=0 THEN 0 ELSE T1.TD+(T2.Debtor-T1.Creditor) END,
    CASE WHEN T2.Creditor=0 THEN 0 ELSE T2.Creditor-T1.TD END
     FROM SAMPLEDATA T1 JOIN @TableData T2 ON T1.id=T2.id-1 
)
select * from SAMPLEDATA

---------------------------------
id  Debtor  Creditor    TD  TC
---------------------------------
0   0       400     0       400
1   1000    0       600     0
2   2000    0       2600    0
3   0       5000    0       2400
4   10      0       -4990   0
5   0       20      0       5010
---------------------------------