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select a.hacker_id,a.name,sum(a.scr) from ( select hack.hacker_id,hack.name,max(sub.score) as scr from Hackers hack inner join Submissions sub on hack.hacker_id=sub.hacker_id group by hack.hacker_id,hack.name,sub.challenge_id ) a group by a.hacker_id,a.name having sum(a.scr) <> 0 order by sum(a.scr) desc,a.hacker_id asc
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