Contest Leaderboard

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    WITH Max_Scores AS ( SELECT hacker_id, challenge_id, MAX(score) AS max_score FROM Submissions GROUP BY hacker_id, challenge_id ), Total_Scores AS ( SELECT hacker_id, SUM(max_score) AS total_score FROM Max_Scores GROUP BY hacker_id ) SELECT h.hacker_id, h.name, ts.total_score FROM Total_Scores ts JOIN Hackers h ON ts.hacker_id = h.hacker_id WHERE ts.total_score > 0 ORDER BY ts.total_score DESC, h.hacker_id;