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I have submitted this code
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 and c.difficulty_level = d.difficulty_level
group by h.hacker_id, h.name
having count(s.hacker_id) > 1
order by count(s.hacker_id) desc, s.hacker_id asc
I got the result. I cannot explain query because I have submiited this queries 2 years ago. Sorry for explainaton. I hope you understand.
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I have submitted this code 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 and c.difficulty_level = d.difficulty_level group by h.hacker_id, h.name having count(s.hacker_id) > 1 order by count(s.hacker_id) desc, s.hacker_id asc I got the result. I cannot explain query because I have submiited this queries 2 years ago. Sorry for explainaton. I hope you understand.