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Oracle Version:
select hacker_id, name from (select s.hacker_id, h.name, count(1) cnt from submissions s inner join hackers h on s.hacker_id = h.hacker_id inner join challenges c on s.challenge_id = c.challenge_id inner join difficulty d on c.difficulty_level = d.difficulty_level and s.score = d.score group by s.hacker_id, h.name) a where cnt > 1 order by cnt desc, hacker_id;
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Oracle Version: