데이터 공부를 기록하는 공간

https://www.hackerrank.com/challenges/interviews/problem Interviews | HackerRank find total number of view, total number of unique views, total number of submissions and total number of accepted submissions. www.hackerrank.com SELECT CON.contest_id, CON.hacker_id, CON.name, SUM(total_submissions) as A, SUM(total_accepted_submissions) as B, SUM(total_views) as C, SUM(total_unique_views) as D FROM..