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https://leetcode.com/problems/trips-and-users/ Trips and Users - LeetCode Level up your coding skills and quickly land a job. This is the best place to expand your knowledge and get prepared for your next interview. leetcode.com [서브쿼리 사용] SELECT request_at Day ,ROUND(COUNT(IF(status != 'completed', TRUE, NULL))/COUNT(*), 2)'Cancellation Rate' FROM Trips WHERE client_id NOT IN (SELECT users_id FR..