Question

我一直试图让一个运行总和在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，我有两个列，一个有一年，一个有当年的部件数，我希望第三个是多年来部件数的运行总和。

前两列的我的SQL看起来像这样：

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

有关如何让第三列作为运行总和工作的任何建议？谢谢你的帮助！

Answer 1

如果您创建报告，则会有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：

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]);

Answer 2

尝试以下代码：

SELECT Year([EQ1].[EOL]) AS Yr, 
Sum(IIf(Year([EQ2].[eol])=Year([EQ1].[eol]),1,0)) AS [current], 
Sum(IIf(Year([EQ2].[eol])<=Year([EQ1].[eol]),1,0)) AS [cumulative]
FROM [equipmentquery] AS EQ1, [equipmentquery] AS [EQ2]
GROUP BY Year([EQ1].[EOL]);

如果您想要运行总计而不是计数：

SELECT Year([EQ1].[EOL]) AS Yr, 
Sum(IIf(Year([EQ2].[eol])=Year([EQ1].[eol]),[EQ2].equipment,0)) AS [current], 
Sum(IIf(Year([EQ2].[eol])<=Year([EQ1].[eol]),[EQ2].equipment,0)) AS [cumulative]
FROM [equipmentquery] AS EQ1, [equipmentquery] AS [EQ2]
GROUP BY Year([EQ1].[EOL]);

无法在Access查询中生成运行总和

2 个答案: