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SQL Server version
select h.hacker_id, h.name from submissions s inner join challenges c on s.challenge_id = c.challenge_id inner join difficulty d on c.difficulty_level = d.difficulty_level inner join hackers h on s.hacker_id = h.hacker_id where s.score = d.score group by h.hacker_id, h.name having count(h.hacker_id) > 1 order by count(h.hacker_id) desc, h.hacker_id asc;
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SQL Server version