Query to rank rows in groups

Question

I\'m using Apache Derby 10.10.

I have a list of participants and would like to calculate their rank in their country, like this:

|        Country |           


        

Answer 1

SQL

SELECT c.name AS Country,
       p.name AS Participant,
       p.points AS Points,
       (SELECT COUNT(*)
        FROM Participant p2
        JOIN Team t2 ON p2.team_id = t2.id
        WHERE t2.country_id = t.country_id
          AND (p2.points < p.points
               OR p2.points = p.points AND p2.name <= p.name)) AS country_rank
FROM Country c
JOIN Team t ON c.id = t.country_id
JOIN Participant p ON t.id = p.team_id
ORDER BY c.name, p.points, p.name;

Online Demo

SQL Fiddle demo: http://sqlfiddle.com/#!5/f48f8/14

Explanation

A simple ANSI-SQL subselect can be used to do the same job, counting the number of records for participants in the same country with a lower score or with the same score and a name that is alphabetically no higher.