Milky's note

https://www.hackerrank.com/challenges/full-score/problem?isFullScreen=true Top Competitors | HackerRank Query a list of top-scoring hackers. www.hackerrank.com [문제] Julia just finished conducting a coding contest, and she needs your help assembling the leaderboard! Write a query to print the respective hacker_id and name of hackers who achieved full scores for more than one challenge. Order your..