Question

我正在尝试为特定的EmployeeID重新计算几个不同的数据列。

我希望hrs_YTD列保持运行总计。更新此信息的好方法是什么？

HRS_YTD目前有0.00值。我不想在下表中得到结果。

ID | CHEKDATE | CHEKNUMBR | HRS | HRS_YTD

EN344944 | 01/1/2014 | dd1001 | 40.00 | 40.00

EN344944 | 2014年1月8日| dd1002 | 30.00 | 70.00

EN344944 | 1/15/2014 | dd1003 | 32.50 | 102.50

等.....

DECLARE @k_external_id varchar(32)

SET @k_external_id = 'EN344944'

SELECT * INTO #tmpA
FROM dbo.gp_check_hdr a
WHERE a.EMPLOYID = @k_external_id

SELECT a.ID, a.CHEKNMBR, a.CHEKDATE,
       (SELECT CAST(SUM(a.[hours]) as decimal(18,2)) FROM #tmpA b 
        WHERE (b.CHEKDATE <= a.CHEKDATE and YEAR(b.CHEKDATE) = 2013)) AS hrs_ytd
FROM #tmpA a
WHERE YEAR(a.CHEKDATE) = 2013

我真的不知道我是否可以像使用#tmpA b那样使用别名，但过去它对我有用。这并不意味着它是一种很好的做事方式。有人能告诉我一种方法来实现我需要的结果吗？

Answer 1

没有对此进行测试，但您可以尝试一下

DECLARE @k_external_id varchar(32)

SET @k_external_id = 'EN344944'

SELECT g1.primarykey, g1.ID,g1.CHEKDATE, g1.CHEKNUMBR, g1.HRS ,(SELECT SUM(g2.HRS)
                   FROM dbo.gp_check_hdr g2
                   WHERE g2.ID = @k_external_id AND
                  (g2.primarykey <= g1.primarykey)) as HRS_YTD
FROM   dbo.gp_check_hdr g1
WHERE g1.ID = @k_external_id
ORDER BY g1.primarykey;

http://www.codeproject.com/Articles/300785/Calculating-simple-running-totals-in-SQL-Server

Answer 2

我这样做的方式是computed column和user defined function的组合。

该功能允许聚合数据。在计算列中，您只能使用同一行的字段，因此调用函数（允许）是必要的。

计算列允许它连续工作，无需任何其他查询或临时表等。一旦设置，您不需要运行夜间更新或触发器或任何类型的东西来保持数据更新，包括记录何时更改或删除。

这是我的解决方案......和SqlFiddle：http://www.sqlfiddle.com/#!3/cd8d6/1/0

修改我已对此进行了更新，以反映您需要计算每位员工的运行总计。 SqlFiddle也更新了。

功能：

Create Function udf_GetRunningTotals ( @CheckDate DateTime, @EmployeeID int ) Returns Decimal(18,2) As Begin Declare @Result Decimal(18,2) Select @Result = Cast(Sum(rt.Hrs) As Decimal(18,2)) From RunningTotals rt Where rt.CheckDate <= @CheckDate And Year(rt.CheckDate) = Year(@CheckDate) And rt.EmployeeID = @EmployeeID Return @Result End

表架构：

Create Table [dbo].[RunningTotals]( [ID] [int] Identity(1,1) NOT NULL, [EmployeeID] [int] NOT NULL, [CheckDate] [datetime] NOT NULL, [CheckNumber] [int] NOT NULL, [Hrs] [decimal](18, 2) NOT NULL, [Hrs_Ytd] AS ([dbo].[udf_GetRunningTotals]([CheckDate],[EmployeeID])), -- must add after table creation and function creation due to inter-referencing of table and function Constraint [PK_RunningTotals3] Primary Key Clustered ( [ID] ASC ) With ( PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON ) ) On [PRIMARY]

结果将计算每年的年初至今。

注意 -

您不能按原样创建函数或表，因为它们相互引用。首先，使用除计算列之外的所有列创建表; 然后，创建该功能。最后，更改表并添加计算列。

这是一个完整运行的测试脚本：

-- Table schema Create Table [dbo].[RunningTotals]( [ID] [int] Identity(1,1) NOT NULL, [EmployeeID] [int] NOT NULL, [CheckDate] [datetime] NOT NULL, [CheckNumber] [int] NOT NULL, [Hrs] [decimal](18, 2) NOT NULL, Constraint [PK_RunningTotals3] Primary Key Clustered ( [ID] ASC ) With ( PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON ) ) On [PRIMARY] Go -- UDF Function to compute totals Create Function udf_GetRunningTotals ( @CheckDate DateTime, @EmployeeID int ) Returns Decimal(18,2) As Begin Declare @Result Decimal(18,2) Select @Result = Cast(Sum(rt.Hrs) As Decimal(18,2)) From RunningTotals rt Where rt.CheckDate <= @CheckDate And Year(rt.CheckDate) = Year(@CheckDate) And rt.EmployeeID = @EmployeeID Return @Result End Go -- Add the computed column to the table Alter Table RunningTotals Add [Hrs_Ytd] As (dbo.udf_GetRunningTotals(CheckDate, EmployeeID)) Go -- Insert some test data Insert into RunningTotals Values (334944, '1/1/2014', '1001', 40.00) Insert into RunningTotals Values (334944, '1/5/2014', '1002', 30.00) Insert into RunningTotals Values (334944, '1/15/2014', '1003', 32.50) Insert into RunningTotals Values (334945, '1/5/2014', '1001', 10.00) Insert into RunningTotals Values (334945, '1/6/2014', '1002', 20.00) Insert into RunningTotals Values (334945, '1/8/2014', '1003', 12.50) -- Test the computed column Select * From RunningTotals

Answer 3

你的子查询应该可以正常工作。

我使用表变量代替临时表。

我还将临时表中插入的结果限制为2013，以简化最终的select语句，并将临时表中的结果限制为您所需的结果。唯一的另一件事是使用ID将子查询加入主查询，但是你应该工作，因为你将临时表中的结果限制为特定的ID。

DECLARE 
     @k_external_id varchar(32)
    ,@k_reporting_year int

SET @k_external_id = 'EN344944'
SET @k_reporting_year = 2013

DECLARE @temp TABLE(
     ID NVARCHAR(32)
    ,CheckDate DATE
    ,CheckNumber NVARCHAR(6)
    ,HRS DECIMAL(18,2)
)

INSERT INTO @temp (
     ID
    ,CheckDate
    ,CheckNumber
    ,HRS
)
    SELECT
         ID
        ,CHEKDATE
        ,CHEKNMBR
        ,[hours]
    FROM
        dbo.gp_check_hdr
    WHERE 
            EMPLOYID = @k_external_id
        AND YEAR(a.CHEKDATE) = @k_reporting_year

SELECT 
     ID
    ,CheckDate
    ,CheckNumber
    ,HRS
    ,(SELECT SUM(HRS) FROM @temp b WHERE a.ID = b.ID AND b.CheckDate <= a.CheckDate) AS hrs_ytd
FROM
    @temp a

计算运行总计

3 个答案: