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Plz someone help me ,what's wrong in this query.
select a.hacker_id, a.name from hackers a join submissions b
on a.hacker_id= b.hacker_id where
b.challenge_id in (select a.challenge_id from challenges a join difficulty b on a.difficulty_level=b.difficulty_level)
and b.score in (select a.score from difficulty a join challenges b
on a.difficulty_level=b.difficulty_level)
group by a.hacker_id having count(a.hacker_id)>1
order by count(a.hacker_id) desc, a.hacker_id asc
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Plz someone help me ,what's wrong in this query. select a.hacker_id, a.name from hackers a join submissions b on a.hacker_id= b.hacker_id where b.challenge_id in (select a.challenge_id from challenges a join difficulty b on a.difficulty_level=b.difficulty_level) and b.score in (select a.score from difficulty a join challenges b on a.difficulty_level=b.difficulty_level) group by a.hacker_id having count(a.hacker_id)>1 order by count(a.hacker_id) desc, a.hacker_id asc