https://leetcode.com/problems/movie-rating/description/ 포트폴리오 쓴다고, 그동안 쿼리연습을 못했다.이전 기억 상기시키기에 좋은 쉬운문제 Example 1:Input: Movies table:+-------------+--------------+| movie_id | title |+-------------+--------------+| 1 | Avengers || 2 | Frozen 2 || 3 | Joker |+-------------+--------------+Users table:+-------------+--------------+| user_id ..