在Access查詢中製作運行總和的問題

Question

我被困在試圖獲取運行總和以在Access查詢中工作。 我一直在玩各種Dsum表達式，但它們都導致了錯誤。 基本上，我有兩個欄目，一個是一年，一個是當年的零件數目，我希望第三個是多年來零件數量的總和。

我對前兩列SQL是這樣的：

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

如何獲得第三列作爲一個運行總和工作有什麼建議？ 感謝您的幫助！

Answer 1

如果您創建報告，則有一個property to calculate a running sum。

如果你喜歡一個查詢時，您可以使用子查詢來計算運行總和：

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

試試下面的代碼：

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]); 

ANSD如果你想運行總計而不是計數：

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]);