Getting unique records for each group using sql - sql

Question

I have an sql Log table with two columns like this:
RegistrantID compnayID Creation date
1 1 .....
1 1
2 1
3 1
1 2
2 2
2 2
3 2 .....
I have a stored procedure which brings first record based creation date. It brings one record if two companies has same registrant id so for registrantid 1, It will being first row and not the 5th row, and for registrantId 2, it will bring row 3 but not 6th. I want to get row 1 and 5 for registrantid 1 and 3rd and 6th for registrantid 2, row 4 and 8 for registrant id 3. Here is my stored procedure.
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
Please suggest how to change this stored procedure ?

Answer 1

You need to partition by both RegistrantId and CompanyID
ROW_NUMBER() OVER(PARTITION BY AL.RegistrantID, AL.CompanyID
ORDER BY ActionDate ASC)

Answer 2

Removing where clause RN=1 and adding a distinct should be enough.