在 SQL 中，如何基于以“”开头的字段创建运行总计？

Question

我是一个 sql 新手，正在开发一个程序，我试图根据用户输入的三个字段（Deduction PayCodeCat 和 EmployeeID）捕获运行总计，但是如果员工不在表中，则运行总计列开始时为空。

简化程序：

更改程序 [dbo].[2023_ClaimsInsert] (

@PayCodeCat NVARCHAR(3) ,
@EmployeeID INT ,
@扣除FLOAT )

AS 开始 不设置计数；

插入.dbo。[2023_ClaimsTable] (
支付码猫 , 员工ID ,
扣除 ,
QW_运行平衡 ,
AS_运行平衡 ,
ZX_运行平衡 )

价值观 （@PayCodeCat ,
@员工ID ,
@扣除 ,
(SELECT sum(Deduction)+@Deduction FROM 2023_ClaimsTable CL WHERE @PayCodeCat = 'QW' AND @EmployeeID = CL.EmployeeID) ,
(SELECT SUM(扣除)+@Deduction FROM 2023_ClaimsTable CL WHERE @PayCodeCat = 'AS' AND @EmployeeID = CL.EmployeeID) ,
(SELECT SUM(扣除)+@Deduction FROM 2023_ClaimsTable CL WHERE @PayCodeCat = 'ZX' AND @EmployeeID = CL.EmployeeID)

这些是结果，只要员工是新加入表的，运行余额就会从 Null 开始。

员工ID	支付码猫	扣除	QW_运行平衡	AS_运行平衡	ZX_运行平衡
1	AS	100		空
1	AS	200		300
1	AS	800		1100
2	AS	700		空
2	AS	200		900
1	QW	200	200	1100

我尝试修改值语句以包含 OR IS Null

• （从 AP_2023_ClaimsTable CL 中选择总和（扣减）+@Deduction，其中 @PayCodeCat = 'AP' AND (@EmployeeID = CL.EmployeeID OR CL.EmployeeID IS NULL))

根据我在其他 stackoverflow 答案中发现的内容，我尝试使用 Exists 和 Notists 以及 case 语句，但我只是破坏了代码。

Answer 1

请使用以下查询来获取结果，

SELECT EmployeeID, PayCodeCat, Deduction,
        CASE WHEN PayCodeCat = 'AS' THEN SUM(Deduction) over (Partition by EmployeeID, PayCodeCat Order by rn) END AS AS_RunningBalance,
        CASE WHEN PayCodeCat = 'QW' THEN SUM(Deduction) over (Partition by EmployeeID, PayCodeCat Order by rn) END AS QW_RunningBalance,
        CASE WHEN PayCodeCat = 'ZX' THEN SUM(Deduction) over (Partition by EmployeeID, PayCodeCat Order by rn) END AS ZX_RunningBalance
FROM (
    SELECT *,
            ROW_NUMBER() over (order by EmployeeID, PayCodeCat) as rn
    FROM 2023_ClaimsTable
) a

Answer 2

假设您只想将

@Deduction

应用于与 @PayCodeCat 匹配的

Running Balance

，我认为您的代码看起来会更好，如下所示：

ALTER Procedure [2023_ClaimsInsert] (
      @PayCodeCat   nvarchar(3)
    , @EmployeeID   int
    , @Deduction    float
    ) as
begin
    set nocount on
    insert into [2023_ClaimsTable] (
          PayCodeCat
        , EmployeeID
        , Deduction
        , QW_RunningBalance
        , AS_RunningBalance
        , ZX_RunningBalance
        )
    select
          @PayCodeCat
        , @EmployeeID
        , @Deduction
        , nullIf(
            (select isNull(SUM(Deduction), 0) from [2023 _ClaimsTable]
              where EmployeeID = @EmployeeID and PayCodeCat = 'QW' )
            + case @PayCodeCat when 'QW' then @Deduction else 0 end, 0)
        , nullIf(
            (select isNull(SUM(Deduction), 0) from [2023 _ClaimsTable]
              where EmployeeID = @EmployeeID and PayCodeCat = 'AS' )
            + case @PayCodeCat when 'AS' then @Deduction else 0 end, 0)
        , nullIf(
            (select isNull(SUM(Deduction), 0) from [2023 _ClaimsTable]
              where EmployeeID = @EmployeeID and PayCodeCat = 'ZX' )
            + case @PayCodeCat when 'ZX' then @Deduction else 0 end, 0)
end