https://www.hackerrank.com/challenges/contest-leaderboard/problem?isFullScreen=true Contest Leaderboard | HackerRank Generate the contest leaderboard. www.hackerrank.com [코드] select b.hacker_id, b.name, sum(score) from (select hacker_id, challenge_id, max(score) as score from Submissions group by hacker_id, challenge_id) as a inner join Hackers as b on a.hacker_id = b.hacker_id group by b.hacker..