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In this post, you will find the solution for Contest Leaderboard in SQL-HackerRank Problem. We are providing the correct and tested solutions of coding problems present on HackerRank. If you are not able to solve any problem, then you can take help from our Blog/website.
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Introduction To SQL
SQL stands for Structured Query Language. SQL is used to create, remove, alter the database and database objects in a database management system and to store, retrieve, update the data in a database. SQL is a standard language for creating, accessing, manipulating database management system. SQL works for all modern relational database management systems, like SQL Server, Oracle, MySQL, etc.
- It is a standard language for Relational Database System. It enables a user to create, read, update and delete relational databases and tables.
- All the RDBMS like MySQL, Informix, Oracle, MS Access and SQL Server use SQL as their standard database language.
- SQL allows users to query the database in a number of ways, using English-like statements.
Link for the Problem – Contest Leaderboard SQL – Hacker Rank Solution
Contest Leaderboard SQL – Hacker Rank SolutionProblem:
You did such a great job helping Julia with her last coding contest challenge that she wants you to work on this one, too!
The total score of a hacker is the sum of their maximum scores for all of the challenges. Write a query to print the hacker_id, name, and total score of the hackers ordered by the descending score. If more than one hacker achieved the same total score, then sort the result by ascending hacker_id. Exclude all hackers with a total score of from your result.
Input Format
The following tables contain contest data:
- Hackers: The hacker_id is the id of the hacker, and name is the name of the hacker.
- Submissions: The submission_id is the id of the submission, hacker_id is the id of the hacker who made the submission, challenge_id is the id of the challenge for which the submission belongs to, and score is the score of the submission.
Sample Input
Hackers Table: 
Submissions Table: 
Sample Output
4071 Rose 191 74842 Lisa 174 84072 Bonnie 100 4806 Angela 89 26071 Frank 85 80305 Kimberly 67 49438 Patrick 43
Explanation
Hacker 4071 submitted solutions for challenges 19797 and 49593, so the total score .
Hacker 74842 submitted solutions for challenges 19797 and 63132, so the total score
Hacker 84072 submitted solutions for challenges 49593 and 63132, so the total score .
The total scores for hackers 4806, 26071, 80305, and 49438 can be similarly calculated.
Contest Leaderboard SQL – Hacker Rank SolutionSELECT X.hacker_id,
(SELECT H.NAME FROM HACKERS H
WHERE H.HACKER_ID = X.HACKER_ID) NAME,
SUM(X.SCORE) TOTAL_SCORE FROM
(SELECT HACKER_ID, MAX(SCORE) SCORE FROM SUBMISSIONS S
GROUP BY 1, S.CHALLENGE_ID) X
GROUP BY 1
HAVING TOTAL_SCORE > 0
ORDER BY TOTAL_SCORE DESC, HACKER_ID;