MS Access Select top n query grouped by multiple fields

Question

This is part 2 of a problem that was already answered by peterm on this board. Thanks again peterm!

So I have code that will return the top 3 test scores for a give

Answer 1

You can do something like this

SELECT StudentID, Year, Subject,  AVG(TestScore) AS AvgScore
  FROM
(
  SELECT StudentID, Year, Subject, TestScore
   FROM MyTable t
   WHERE TestID IN
  (
   SELECT TOP 3 TestID 
     FROM MyTable
    WHERE StudentID = t.StudentID
      AND Year = t.Year
      AND Subject = t.Subject
    ORDER BY TestScore DESC, TestID
  )
) q
 GROUP BY StudentID, Year, Subject
 ORDER BY StudentID, Year, Subject;

Sample output:

| STUDENTID | YEAR | SUBJECT | AVGSCORE |
|-----------|------|---------|----------|
|         1 | 2012 |       1 |       91 |
|         1 | 2012 |       2 |       84 |
|         2 | 2012 |       1 |       94 |
|         2 | 2012 |       3 |       95 |

Here is SQLFiddle demo.
Demo as usually is for SQL Server but expected to work in MS Access, maybe with minor syntactic tweaks