每月年初至今

Question

我有一张名为 Sales 的表：

ID 日期 部门ID 金额 1 10-12-2009 12 10 2 18-01-2010 3 23 3 08-02-2010 4 7 ...

现在我需要从金额列中检索每个月和每个部门的 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

但这会返回内部 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

此查询返回每个月正确的年初至今金额，但需要 6 分钟来处理所有 4800 条记录。这当然太慢了。谁能帮助我在可接受的时间内（

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)

如果您仍然需要更快的速度，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。