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Could you explain the final section of your code:
cn not in (select count(c2.challenge_id) from challenges as c2 group by c2.hacker_id having c.hacker_id != c2.hacker_id)
It seems to me as if it's checking that the count of challenges is NOT in the set of 'unique' hackers.
Challenges
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Could you explain the final section of your code:
It seems to me as if it's checking that the count of challenges is NOT in the set of 'unique' hackers.