How do I select the first row per group in an SQL Query?

Question

I\'ve got this SQL query:

SELECT   Foo, Bar, SUM(Values) AS Sum
FROM     SomeTable
GROUP BY Foo, Bar
ORDER BY Foo DESC, Sum DESC

This resul

Answer 1

(EDITED Based on edited question) Then, since you wish to filter based on the value of an aggregated column, what you need is a Having Clause.

  SELECT p.Nick, r.Description, SUM(m.Value) Sum
  FROM Marks m
    JOIN Players p
      ON m.PlayerID = p.ID 
    JOIN Reasons r 
      ON m.ReasonId = r.ID
  GROUP BY p.Nick, r.Description
  Having SUM(m.Value) =
      (Select Max(Sum) From
        (SELECT SUM(m.Value) Sum
         FROM Marks mi
           JOIN Players pi
              ON mi.PlayerID = pi.ID 
           JOIN Reasons r i
             ON mi.ReasonId = ri.ID
         Where pi.Nick = p.Nick
         GROUP BY pi.Nick, ri.Description))

  Order By p.Nick, Sum Desc