Question

I have been stumped on this for quite awhile. Request#, SlotId, Segment, and Version all make up the primary key. What i want from my stored proc is to be able to retrieve all rows by passing in the Request # and Segment, but for each slot i want the most recent effective date on or before todays date and from that i need the highest version #. I appriciate your time.

Values in database
Request#  SlotId  Segment Version Effective Date  ContentId
 A123       1       A       1         2012-01-01      1
 A123       2       A       1         2012-01-01      2 
 A123       2       A       2         2012-02-01      34
 A123       2       A       3         2012-02-01      24
 A123       2       A       4         2015-01-01      6 //beyond todays date. dont want

Values I want to return from my stored proc when i pass in A123 for Request # and A for Segment.

 A123       1       A       1         2012-01-01      1
 A123       2       A       3         2012-02-01      24

Answer 1

The query could be written like this:

; WITH cte AS
    ( SELECT Request, SlotId, Segment, Version, [Effective Date], ContentId,
             ROW_NUMBER() OVER ( PARTITION BY Request, Segment, SlotId
                                 ORDER BY Version DESC ) AS RowN
      FROM
            tableX
      WHERE
            Request = @Req  AND  Segment = @Seg             --- the 2 parameters
        AND [Effective Date] < DATEADD(day, 1, GETDATE())
    )
  SELECT Request, SlotId, Segment, Version, [Effective Date], ContentId
  FROM cte
  WHERE Rn = 1 ;