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select h.hacker_id,h.name from submissions s join challenges c on s.challenge_id = c.challenge_id
join difficulty d on c.difficulty_level = d.difficulty_level join hackers h on s.hacker_id = h.hacker_id where s.score = d.score group by h.hacker_id,h.name having count(s.hacker_id)>1 order by count(h.hacker_id) desc,h.hacker_id asc;
this will run in ms sql server
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select h.hacker_id,h.name from submissions s join challenges c on s.challenge_id = c.challenge_id join difficulty d on c.difficulty_level = d.difficulty_level join hackers h on s.hacker_id = h.hacker_id where s.score = d.score group by h.hacker_id,h.name having count(s.hacker_id)>1 order by count(h.hacker_id) desc,h.hacker_id asc;
this will run in ms sql server