Question

我有这个名为Sales的表：

ID Date       DepartmentID Amount
1  10-12-2009           12     10
2  18-01-2010            3     23 
3  08-02-2010            4      7
...

现在我需要从每个月和部门的金额列中检索YTD值。

首先我尝试了这个查询：

SELECT MonthSales.[Month], MonthSales.DepartmentID,

    (SELECT SUM(SalesAmount.Amount) FROM Sales AS SalesAmount
        WHERE (SalesAmount.[Date] >= DATEADD(Month, -12, MonthSales.[Month]) 
            AND SalesAmount.[Date] < DATEADD(Month, 1, MonthSales.[Month]))
        AND SalesAmount.DepartmentID = MonthSales.DepartmentID) AS Amount

FROM (SELECT dateadd(month, datediff(month, 0, [Date]),0) AS [Month], DepartmentID
    FROM Sales) AS MonthSales
GROUP BY MonthSales.[Month], MonthSales.DepartmentID

但是这返回了内部SQL Server错误

为了绕过这个错误，我写了以下查询：

SELECT CompareSales.StartDate, CompareSales.EndDate, CompareSales.DepartmentID,

    (SELECT SUM(SalesAmount.Amount) FROM Sales AS SalesAmount
        WHERE (SalesAmount.[Date] >= CompareSales.StartDate AND SalesAmount.[Date] < 
            DATEADD(Month, 1, CompareSales.EndDate))
        AND SalesAmount.DepartmentID = CompareSales.DepartmentID) AS Amount

FROM (SELECT DATEADD(Month, -12, PeriodSales.EndDate) AS StartDate,    
    PeriodSales.EndDate, PeriodSales.DepartmentID
    FROM (SELECT DISTINCT bms.DATESERIAL(DATEPART(Year, EndSales.[Date]), DATEPART 
        (Month, EndSales.[Date]), 1) AS EndDate, EndSales.DepartmentID
        FROM Sales AS EndSales) AS PeriodSales) AS CompareSales

GROUP BY CompareSales.StartDate, CompareSales.EndDate, CompareSales.DepartmentID
ORDER BY CompareSales.StartDate

此查询返回了每个月的正确年份数量，但需要6分钟来处理所有4800条记录。这当然太慢了。任何人都可以帮我查询将在可接受的时间内（<30秒）返回YTD金额的查询吗？

谢谢，

鲍勃

Answer 1

试试这个：

DECLARE @YourTable table (RowID int, DateOf datetime, DepartmentID int, Amount int)

INSERT INTO @YourTable VALUES (1,'12-10-2009',12,10) --changed dd-mm-yyyy to mm-dd-yyyy so it would work on my system
INSERT INTO @YourTable VALUES (2,'01-18-2010', 3,23)
INSERT INTO @YourTable VALUES (3,'02-08-2010', 4, 7)

SELECT
    DATEPART(mm,DateOf) AS MonthOf,DepartmentID,SUM(Amount) AS TotalAmount
    FROM @YourTable
    WHERE DateOf>='01-01-2010' AND DateOF<'01-01-2011'
    GROUP BY DATEPART(mm,DateOf),DepartmentID

输出

MonthOf     DepartmentID TotalAmount
----------- ------------ -----------
1           3            23
2           4            7

(2 row(s) affected)

如果仍然需要更高的速度，请创建一个PERSISTED计算列：MonthOfDate，即DATEPART（mm，DateOf）并在其上添加索引：

ALTER TABLE YourTable ADD MonthOfDate AS DATEPART(mm,DateOf) PERSISTED 

CREATE NONCLUSTERED INDEX IX_YourTable_MonthOfDate 
ON YourTable (MonthOfDate)

甚至：

CREATE NONCLUSTERED INDEX IX_YourTable_MonthOfDate 
ON YourTable (DateOf,MonthOfDate)

如果您不想要PERSISTED计算列，请创建索引视图。

年初至今

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