WITH submissions_clean AS (
    SELECT distinct submission_id,
    hacker_id,
    challenge_id,
    score
    FROM Submissions
    )    
SELECT s.hacker_id,
    h.name
FROM submissions_clean s
JOIN Challenges c
ON s.challenge_id = c.challenge_id
JOIN Difficulty d
ON c.difficulty_level = d.difficulty_level
JOIN Hackers h
ON h.hacker_id = s.hacker_id
WHERE d.score = s.score
GROUP BY s.hacker_id, h.name
HAVING COUNT(*) >1
ORDER BY COUNT(*) desc, s.hacker_id asc