Question

我有一个带有两列的sql Log表，如下所示：

RegistrantID   compnayID  Creation date

1                1          .....
1                1             
2                1
3                1
1                2
2                2
2                2
3                2          .....

我有一个存储过程，它带来了第一个基于记录的创建日期。如果两家公司具有相同的注册人ID，那么它会带来一个记录，因此对于注册1，它将是第一行而不是第5行，而对于注册人ID 2，它将带来第3行但不是第6行。我希望第1行和第5行为注册表1，第3和第6行为注册人2，第4行和第8行为注册人ID 3.这是我的存储过程。

ALTER PROCEDURE [dbo].[hr_ActionLog_GetList]
    @Action INT = NULL,
    @DateFrom DATETIME = NULL,
    @DateTo DATETIME = NULL,
    @CompanyID INT = NULL,
    @RegistrantID INT = NULL,
    @VacancyID INT = NULL,
    @Language INT = 1
AS
BEGIN

WITH CTE AS 
(
    SELECT AL.*,
        RV.Forename,
        RV.Surname,
        RV.Username AS RegistrantUsername,
        E.Forename AS EmployeeForename,
        E.Surname AS EmployeeSurname,
        U.Username,
        CASE
            WHEN @Language = 2 THEN C.NameLang2
            ELSE C.NameLang1
        END AS CompanyName,
        CASE
            WHEN @Language = 2 THEN V.JobTitleLang2
            ELSE V.JobTitleLang1
        END AS JobTitle
        , ROW_NUMBER() OVER(PARTITION BY AL.RegistrantID
                       ORDER BY ActionDate ASC) AS RN
    FROM dbo.hr_ActionLog AL LEFT OUTER JOIN dbo.RegistrantsListView RV ON AL.RegistrantID = RV.RegistrantID 
        LEFT OUTER JOIN dbo.hr_Employees E ON AL.EmployeeID = E.EmployeeID
        LEFT OUTER JOIN dbo.hr_Users U ON AL.UserID = U.UserID
        LEFT OUTER JOIN dbo.hr_Companies C ON AL.CompanyID = C.CompanyID
        LEFT OUTER JOIN dbo.hr_Vacancies V ON AL.VacancyID = V.VacancyID
        LEFT OUTER JOIN dbo.hr_Companies VC ON V.CompanyID = VC.CompanyID
    WHERE (@Action IS NULL OR AL.Action = @Action)
        AND (@DateFrom IS NULL OR dbo.DateOnly(AL.ActionDate) >= dbo.DateOnly(@DateFrom))
        AND (@DateTo IS NULL OR dbo.DateOnly(AL.ActionDate) <= dbo.DateOnly(@DateTo))
        AND (@CompanyID IS NULL OR AL.CompanyID = @CompanyID)
        AND (@RegistrantID IS NULL OR AL.RegistrantID = @RegistrantID)
        AND (@VacancyID IS NULL OR AL.VacancyID = @VacancyID)
   --ORDER BY AL.ActionDate DESC
    )

    SELECT *

FROM CTE
WHERE RN = 1;

END

请建议如何更改此存储过程？

Answer 1

您需要按RegistrantId和CompanyID进行分区

ROW_NUMBER() OVER(PARTITION BY AL.RegistrantID, AL.CompanyID 
                  ORDER BY ActionDate ASC)

Answer 2

删除where子句RN = 1并添加distinct应该就足够了。

使用sql为每个组获取唯一记录

2 个答案: