[A hundred words are not as good as seeing once] Advanced SQL for data analysis
Advanced: Subquery HackerRank Challenges Problem Solving + With statement
delete를 사용해서 문제를 풀수 있을까요
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- DELETE FROM (SELECT h.hacker_id, h.name, count(c.challenge_id) AS cc FROM hackers AS h LEFT JOIN challenges AS c ON h.hacker_id = c.hacker_id GROUP BY h.hacker_id, h.name ORDER BY cc DESC, h.hacker_id) WHERE cc > 1 AND cc < MAX(cc)