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  1. Prepare
  2. SQL
  3. Basic Join
  4. Top Competitors
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Top Competitors

  • jr_delaoz
     + 0 comments

    My solution:

    SELECT h.hacker_id, h.name FROM hackers h JOIN submissions s ON h.hacker_id = s.hacker_id JOIN challenges c ON s.challenge_id = c.challenge_id JOIN difficulty d ON c.difficulty_level = d.difficulty_level WHERE s.score = d.score GROUP BY h.hacker_id, h.name HAVING COUNT(DISTINCT c.challenge_id) > 1 ORDER BY COUNT(DISTINCT c.challenge_id) DESC, h.hacker_id ASC