Hacker Rank Interview Question

Interviews Samantha interviews many candidates from different colleges using coding challenges and contests. Write a query to print the contest_id, hacker_id, name, and the sums of total_submissions, total_accepted_submissions, total_views, and total_unique_views for each contest sorted by contest_id. Exclude the contest from the result if all four sums are . Note: A specific contest can be used to screen candidates at more than one college, but each college only holds screening contest. Input Format The following tables hold interview data: Contests: The contest_id is the id of the contest, hacker_id is the id of the hacker who created the contest, and name is the name of the hacker. Colleges: The college_id is the id of the college, and contest_id is the id of the contest that Samantha used to screen the candidates. Challenges: The challenge_id is the id of the challenge that belongs to one of the contests whose contest_id Samantha forgot, and college_id is the id of the college where the challenge was given to candidates. View_Stats: The challenge_id is the id of the challenge, total_views is the number of times the challenge was viewed by candidates, and total_unique_views is the number of times the challenge was viewed by unique candidates. 2/3 Submission_Stats: The challenge_id is the id of the challenge, total_submissions is the number of submissions for the challenge, and total_accepted_submission is the number of submissions that achieved full scores. Sample Input Contests Table: Colleges Table: Challenges Table: View_Stats Table: Submission_Stats Table: 3/3 Sample Output 66406 17973 Rose 111 39 156 56 66556 79153 Angela 0 0 11 10 94828 80275 Frank 150 38 41 15 Explanation The contest is used in the college . In this college , challenges and are asked, so from the view and submission stats: Sum of total submissions Sum of total accepted submissions Sum of total views Sum of total unique views Similarly, we can find the sums for contests and .