Tente isto:
SELECT gamers.*
FROM gamers
INNER JOIN
(SELECT
max(score) as maxscore,
gameid from gamers
GROUP BY gameid) AS b
ON (b.gameid = gamers.gameid AND b.maxscore=gamers.score) ;
ORDER BY score DESC, gameid;
Isso irá produzir:
+---------+--------+-------+
| gamerid | gameid | score |
+---------+--------+-------+
| 4 | 1 | 90 |
| 5 | 2 | 40 |
| 8 | 3 | 30 |
+---------+--------+-------+
3 rows in set (0.00 sec)
A outra opção que você pode fazer é criar uma tabela temporária ou uma visão (se você não gostar de subconsulta).
create temporary table games_score (
SELECT max(score) as maxscore, gameid FROM gamers GROUP BY gameid
);
Então:
SELECT gamers.*
FROM gamers
INNER JOIN games_score AS b ON (b.gameid = gamers.gameid AND b.maxscore=gamers.score)
ORDER BY score DESC, gameid;
OU uma visualização:
create or replace view games_score AS
SELECT max(score) as maxscore, gameid FROM gamers GROUP BY gameid;
Então:
SELECT gamers.*
FROM gamers
INNER JOIN games_score AS b ON (b.gameid = gamers.gameid AND b.maxscore=gamers.score)
ORDER BY score DESC, gameid;
