MS Access 2010 在查询中运行总计

Question

我不是 Access 的忠实粉丝，但对于这个项目，我被要求创建一个 Access 数据库。我为其他数据库类型创建了类似的东西，所以它并不太难。我已经弄清楚了大部分，但运行的总数让我头疼。

我有下表：表名attendanceView

查询：SELECT * FROM attendanceView

======================================================================================
agentID    |     incurrredDate     |   points    |    OneFallOff     |    TwoFallOff
======================================================================================
chtall     |       10/7/2013       |     2       |       2           |        2
chtall     |       10/15/2013      |     2       |       2           |        2
chtall     |       11/26/2013      |     2       |       2           |        2
chtall     |       12/17/2013      |     2       |       2           |        2
vimunson   |       7/22/2013       |     2       |       2           |        2
vimunson   |       7/29/2013       |     2       |       1           |        1
vimunson   |       12/6/2013       |     1       |       1           |        1

此查询执行查找OneFallOff 和TwoFallOff 的值所需的操作。但是我需要找到一种方法来为每个agentID 运行总计TwoFallOff。例如chtall 有四条记录，如下图所示：

==================================================================================================
agentID    |     incurrredDate     |   points    |    OneFallOff     |    TwoFallOff     |   total
==================================================================================================
chtall     |       10/7/2013       |     2       |       2           |        2         |    2
chtall     |       10/15/2013      |     2       |       2           |        2         |    4
chtall     |       11/26/2013      |     2       |       2           |        2         |    6
chtall     |       12/17/2013      |     2       |       2           |        2         |    8
vimunson   |       7/22/2013       |     2       |       2           |        2         |    2
vimunson   |       7/29/2013       |     2       |       1           |        1         |    3
vimunson   |       12/6/2013       |     1       |       1           |        1         |    4

我试过DSUM() 没用，或者我用错了。如果在表中不清楚，total 列会在代理更改时重置回 0。

Answer 1

您可以通过相关子查询获得所需的内容。

SELECT
    a1.agentID,
    a1.incurrredDate,
    a1.points,
    a1.OneFallOff,
    a1.TwoFallOff
    (
        SELECT Sum(a2.TwoFallOff)
        FROM attendanceView AS a2
        WHERE
                a2.agentID = a1.agentID
            AND a2.incurrredDate <= a1.incurrredDate
    ) AS total
FROM attendanceView AS a1;

您也可以使用DSum 执行此操作，但是您需要在DSum WhereCondition 选项中使用带有agentID 和incurrredDate 的分隔符。这似乎比子查询方法更努力，而且我发现它更容易出错。

SELECT
    a.agentID,
    a.incurrredDate,
    a.points,
    a.OneFallOff,
    a.TwoFallOff,
    DSum
        (
            "TwoFallOff", "attendanceView",
            "agentID = '" & a.agentID & "' " &
            "AND incurrredDate <= " & 
            Format(a.incurrredDate, "\#yyyy-m-d\#")
        ) AS total
FROM attendanceView AS a;

两个查询都使用 Access 2007 中的示例数据返回您请求的结果。