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Inner Join Submissions s on h.hacker_id = s.hacker_id
Inner Join Challenges c on s.challenge_id = c.challenge_id
Inner join Difficulty d on d.difficulty_level = c.difficulty_level
where s.score = d.score
group by h.hacker_id, h.name
having count(s.challenge_id ) > 1
Order By count(s.challenge_id) desc, hacker_id asc
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select h.hacker_id, h.name from hackers h
Inner Join Submissions s on h.hacker_id = s.hacker_id Inner Join Challenges c on s.challenge_id = c.challenge_id Inner join Difficulty d on d.difficulty_level = c.difficulty_level
where s.score = d.score
group by h.hacker_id, h.name
having count(s.challenge_id ) > 1
Order By count(s.challenge_id) desc, hacker_id asc