Convert SQL Server ROW_NUMBER() OVER(PARTITION BY() Query to Access

Question

Hi,
I am having trouble with converting this SQL Server query to Access. If anyone can give me help I would appreciate it.
SELECT B.AMOUNT_REQUESTED, B.INIT_OFF, B.MBR_NBM, B.STATUS, B.APPLICATION_NBR
FROM
SELECT AMOUNT_REQUESTED, INIT_OFF, MBR_NBM, STATUS, APPLICATION_NBR, ROW_NUMBER() OVER(PARTITION BY MBR_NBM ORDER BY MBR_NBM) RN
FROM LOAN_DATA
WHERE APPLICATION_DATE BETWEEN '20150420' AND '20150425'
) B
WHERE RN = 1
ORDER BY B.MBR_NBM

Answer 1

While there is no equivalent to ROW_NUMBER(), it appears that you are just wanting the first row of each group, and that CAN be accomplished in Access, but I do wonder why you would WANT to do that in Access if your data is stored in SQL Server.  As
Tom indicated a Pass Through query object is likely your best bet -- or a View in SQL Server, then create a Linked Table object that points to it.
To get the first of each group ... which is essentially a TOP n, where n = 1 ... so .. the first thing you will want to indentify is a second field to use as a Key in order to define the "first" row you want in the group.  In your SQL
statement, you are ordering my mbr_nbm, so the secondary sort is unknown -- likely predicable, but unknown with out knowledge of the schema ... so, I will provide samples by using APPLICATION_DATE as the sort key.
This one is the "first" of a series with the assumption that the one you want is the one with the "biggest"/"most recent" APPLICATION_DATE. 
SELECT vLoanData.AMOUNT_REQUESTED, vLoanData.INIT_OFF, vLoanData.MBR_NBM, vLoanData.STATUS, vLoanData.APPLICATION_NBR
FROM LOAN_DATA As vLoanData
INNER JOIN
(SELECT MBR_NBM, Max(APPLICATION_DATE) As LastAppDate
FROM LOAN_DATA As vLast
GROUP BY MBR_NBM) As vLastApp ON vLoanData.MBR_NBM = vLastApp.MBR_NBM And vLoadData.APPLICATION_DATE = vLastApp.LastAppDate
Or ... the following is a TOP n query where n = 1.
SELECT vLoanData.AMOUNT_REQUESTED, vLoanData.INIT_OFF, vLoanData.MBR_NBM, vLoanData.STATUS, vLoanData.APPLICATION_NBR
FROM LOAN_DATA As vLoanData
WHERE (vLoanData.MBR_NBM & '|' & vLoanData.APPLICATION_DATE)
IN (SELECT TOP 1 (vCorrelated.MBR_NBM & '|' & vCorrelated.APPLICATION_DATE) As Key
FROM LOAN_DATA As vCorrelated
WHERE vCorrelated.MBR_NBM = vLoanData.MBR_NBM
ORDER BY vCorrelated.MBR_NBM, vCorrelated.APPLICATION_DATE DESC)
This second example is not going to win you any points with respect to speed, but is truly a closer model to the TOP N type thing you are doing in SQL Server.
Hope that helps!
Brent Spaulding | Access MVP