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SELECT h.hacker_id, h.name, SUM(max_scores.max_score) AS total_score
FROM hackers h
JOIN (
SELECT s.hacker_id, s.challenge_id, MAX(s.score) AS max_score
FROM submissions s
GROUP BY s.hacker_id, s.challenge_id
) AS max_scores ON h.hacker_id = max_scores.hacker_id
GROUP BY h.hacker_id, h.name
HAVING SUM(max_scores.max_score) > 0
ORDER BY total_score DESC, h.hacker_id ASC;
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SELECT h.hacker_id, h.name, SUM(max_scores.max_score) AS total_score FROM hackers h JOIN ( SELECT s.hacker_id, s.challenge_id, MAX(s.score) AS max_score FROM submissions s GROUP BY s.hacker_id, s.challenge_id ) AS max_scores ON h.hacker_id = max_scores.hacker_id GROUP BY h.hacker_id, h.name HAVING SUM(max_scores.max_score) > 0 ORDER BY total_score DESC, h.hacker_id ASC;