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h.name,
COUNT(c.challenge_id) AS c_count
FROM Hackers h
JOIN Challenges c ON c.hacker_id = h.hacker_id
GROUP BY h.hacker_id, h.name
HAVING c_count =
(SELECT COUNT(c2.challenge_id) AS c_max
FROM challenges as c2
GROUP BY c2.hacker_id
ORDER BY c_max DESC limit 1)
OR c_count IN
(SELECT DISTINCT c_compare AS c_unique
FROM (SELECT h2.hacker_id,
h2.name,
COUNT(challenge_id) AS c_compare
FROM Hackers h2
JOIN Challenges c ON c.hacker_id = h2.hacker_id
GROUP BY h2.hacker_id, h2.name) counts
GROUP BY c_compare
HAVING COUNT(c_compare) = 1)
ORDER BY c_count DESC, h.hacker_id;
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