无法在 Access 查询中进行运行总和 [英] Trouble making a running sum in Access query

问题描述

我一直在尝试获取运行总和以在 Access 查询中工作.我一直在玩各种 Dsum 表达式，但它们都导致了错误.基本上，我有两列，一个是年份，一个是那一年的零件数量，我希望第三个是多年来零件数量的运行总和.

I'm stuck trying to get a running sum to work in an Access query. I've been playing around with various Dsum expressions, but they all have resulted in errors. Basically, I have two columns, one with a year, one with a count of parts for that year, and I would like the third to be a running sum of the part count over the years.

前两列的 SQL 如下所示:

My SQL for the first two columns looks like this:

    SELECT DatePart("yyyy",[EoL]) AS AYear, Count(EquipmentQuery.Equipment) AS EquipCount
    FROM EquipmentQuery
    GROUP BY DatePart("yyyy",[EoL])
    ORDER BY DatePart("yyyy",[EoL]);

关于如何让第三列作为运行总和工作的任何建议?感谢您的帮助！

Any suggestions on how to get the third column to work as a running sum? Thanks for the help!

推荐答案

如果您创建报告，则有一个 计算运行总和的属性.

If you create a report, there is a property to calculate a running sum.

如果您更喜欢查询，可以使用子查询来计算运行总和:

If you prefer a query, you can use a subquery to calculate the running sum:

SELECT  DatePart("yyyy",[EoL]) AS AYear
,       Count(eq1.Equipment) AS EquipCount
,       (
        SELECT  Count(eq2.Equipment)
        FROM    EquipmentQuery eq2
        WHERE   DatePart("yyyy",eq2.[EoL]) <= DatePart("yyyy",eq1.[EoL])
        ) AS RunningSuma
FROM    EquipmentQuery AS eq1
GROUP BY 
        DatePart("yyyy",[EoL])
ORDER BY 
        DatePart("yyyy",[EoL]);

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