HR-SQL Top Competitors

1 개요

HR-SQL Top Competitors

• https://www.hackerrank.com/challenges/full-score/problem

해커랭크 SQL

문제	DB2	MS SQL	MySQL	Oracle
HR-SQL Basic Join e
HR-SQL Asian Population
HR-SQL African Cities
HR-SQL Average Population of Each Continent
HR-SQL The Report
HR-SQL Top Competitors
HR-SQL Ollivander's Inventory
HR-SQL Challenges
HR-SQL Contest Leaderboard

2 MySQL

SELECT H.hacker_id, H.name
FROM Submissions S
INNER JOIN Challenges C ON S.challenge_id=C.challenge_id
INNER JOIN Difficulty D ON C.difficulty_level=D.difficulty_level 
INNER JOIN Hackers H ON S.hacker_id=H.hacker_id
WHERE S.score=D.score
GROUP BY H.hacker_id, H.name
HAVING COUNT(S.hacker_id) > 1
ORDER BY COUNT(S.hacker_id) DESC, S.hacker_id