Untitled

select h.hacker_id, h.name from Submissions as s join Hackers as h 
on s.hacker_id = h.hacker_id 
join Challenges as c on s.challenge_id = c.challenge_id
join Difficulty as d on c.Difficulty_level = d.Difficulty_level
where s.score = d.score 
group by h.hacker_id, h.name 
having count(*) > 1
order by count(*) desc, h.hacker_id;