Get the group by on 2 column and date as latest - sql

Question

I have 2 table and I m fetching record as below
The query is as
Select BMC.JCRS_Mem_crs_Code,
BMC.JCRS_Mem_Description,
BMC.JCRS_Mem_Date,
BJCM.JCRS_Mast_Title
From Bus_MemberCourse BMC
Inner Join Bus_JourneymanCourseMaster BJCM
On BMC.JCRS_Mem_crs_Code = BJCM.JCRS_Mast_Code
Where BMC.JCRS_Mem_Completed = 1
And BMC.JCRS_Mem_mem_ID = 5010
Group By BMC.JCRS_Mem_crs_Code,
BMC.JCRS_Mem_Description,
BMC.JCRS_Mem_Date,
BJCM.JCRS_Mast_Title
But what I want is I need to make group by on Jcrs_mem_crs_code and Jcrs_mem_description and if this 2 column data are common then I want to took the latest date only from this multiple dates. i.e. I want to pick only that row and ignore the other rows.

Answer 1

You just want MAX(date):
Select BMC.JCRS_Mem_crs_Code,
BMC.JCRS_Mem_Description,
MAX(BMC.JCRS_Mem_Date) as JCRS_Mem_Date,
BJCM.JCRS_Mast_Title
From Bus_MemberCourse BMC
Inner Join Bus_JourneymanCourseMaster BJCM
On BMC.JCRS_Mem_crs_Code = BJCM.JCRS_Mast_Code
Where BMC.JCRS_Mem_Completed = 1
And BMC.JCRS_Mem_mem_ID = 5010
Group By BMC.JCRS_Mem_crs_Code,
BMC.JCRS_Mem_Description,
BJCM.JCRS_Mast_Title

Answer 2

You don't need a Group by at all (you aren't doing any aggregation in your query).
This can easily be done with a Row_Number() windowed function with a Partition on those two columns whilst ordering by the date:
;With Cte As
(
Select BMC.JCRS_Mem_crs_Code,
BMC.JCRS_Mem_Description,
BMC.JCRS_Mem_Date,
BJCM.JCRS_Mast_Title,
Row_Number() Over (Partition By BMC.JCRS_Mem_crs_Code,
BMC.JCRS_Mem_Description
Order By BMC.JCRS_Mem_Date Desc) As RN
From Bus_MemberCourse BMC
Inner Join Bus_JourneymanCourseMaster BJCM
On BMC.JCRS_Mem_crs_Code = BJCM.JCRS_Mast_Code
Where BMC.JCRS_Mem_Completed = 1
And BMC.JCRS_Mem_mem_ID = 5010
)
Select JCRS_Mem_crs_Code,
JCRS_Mem_Description,
JCRS_Mem_Date,
JCRS_Mast_Title
From Cte
Where RN = 1