MS Access 2010在查询中运行总计

Question

我不是一个很大的Access粉丝,但是对于这个项目,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.我已经弄明白了,但是跑步总数让我头疼.

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

这个查询做的事情需要做,找到值OneFallOff和TwoFallOff.不过,我需要找到一种方式来运行的运行总计TwoFallOff为每个agentID.例如chtall有四条记录,见下文,它应该是这样的:

==================================================================================================
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()哪些不起作用,或者我使用它错了.如果表中不清楚,total当代理更改时,列将重置为0.

Answer 1

您可以使用相关子查询获得所需内容.

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;

你也可以用它做DSum,但你需要用分隔符与agentID和incurrredDate在DSum WhereCondition选项.似乎更多的努力,我发现它比子查询方法更容易出错.

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.