[HackerRank MySQL Server] Challenges - 서브쿼리 WITH절 활용

Challenges Julia asked her students to create some coding challenges. Write a query to print the hacker_id, name, and the total number of challenges created by each student. Sort your results by the total number of challenges in descending order. If more than one student created the same number of challenges, then sort the result by hacker_id. If more than one student created the same number of ..

2021.02.24