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晕目眩。

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

此查询执行了查找OneFallOff和TwoFallOff的值所需执行的操作。但是，我需要找到一种为每个TwoFallOff运行总计agentID的方法。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

我已经尝试了DSUM()哪些不起作用，或者我使用它错了。如果表中不清楚，则total列会在代理更改时重置为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;

您也可以使用DSum执行此操作，但是您需要在agentID WhereCondition 选项中使用incurrredDate和DSum的分隔符。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。

MS Access 2010在查询中运行总计

1 个答案: