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I messed it up because I didn't carefully read the table description. challenges.hacker_id is the id of the hacker that CREATED the challenge, not the id of the guy that participated in it.
Take care of that, because this join condition ruins everything ;)
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Guys,
I messed it up because I didn't carefully read the table description. challenges.hacker_id is the id of the hacker that CREATED the challenge, not the id of the guy that participated in it.
Take care of that, because this join condition ruins everything ;)