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SELECT
c.contest_id,
c.hacker_id,
c.name,
COALESCE(SUM(ss.total_submissions), 0) AS total_submissions,
COALESCE(SUM(ss.total_accepted_submissions), 0) AS total_accepted_submissions,
COALESCE(SUM(v.total_views), 0) AS total_views,
COALESCE(SUM(v.total_unique_views), 0) AS total_unique_views
FROM Contests c
LEFT JOIN Colleges cl ON c.contest_id = cl.contest_id
LEFT JOIN Challenges ch ON cl.college_id = ch.college_id
LEFT JOIN (
SELECT
challenge_id,
SUM(total_submissions) AS total_submissions,
SUM(total_accepted_submissions) AS total_accepted_submissions
FROM Submission_Stats
GROUP BY challenge_id
) ss ON ch.challenge_id = ss.challenge_id
LEFT JOIN (
SELECT
challenge_id,
SUM(total_views) AS total_views,
SUM(total_unique_views) AS total_unique_views
FROM View_Stats
GROUP BY challenge_id
) v ON ch.challenge_id = v.challenge_id
GROUP BY
c.contest_id,
c.hacker_id,
c.name
HAVING
SUM(ss.total_submissions) > 0 OR
SUM(ss.total_accepted_submissions) > 0 OR
SUM(v.total_views) > 0 OR
SUM(v.total_unique_views) > 0
ORDER BY
c.contest_id;
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SELECT c.contest_id, c.hacker_id, c.name, COALESCE(SUM(ss.total_submissions), 0) AS total_submissions, COALESCE(SUM(ss.total_accepted_submissions), 0) AS total_accepted_submissions, COALESCE(SUM(v.total_views), 0) AS total_views, COALESCE(SUM(v.total_unique_views), 0) AS total_unique_views FROM Contests c LEFT JOIN Colleges cl ON c.contest_id = cl.contest_id LEFT JOIN Challenges ch ON cl.college_id = ch.college_id LEFT JOIN ( SELECT challenge_id, SUM(total_submissions) AS total_submissions, SUM(total_accepted_submissions) AS total_accepted_submissions FROM Submission_Stats GROUP BY challenge_id ) ss ON ch.challenge_id = ss.challenge_id LEFT JOIN ( SELECT challenge_id, SUM(total_views) AS total_views, SUM(total_unique_views) AS total_unique_views FROM View_Stats GROUP BY challenge_id ) v ON ch.challenge_id = v.challenge_id GROUP BY c.contest_id, c.hacker_id, c.name HAVING SUM(ss.total_submissions) > 0 OR SUM(ss.total_accepted_submissions) > 0 OR SUM(v.total_views) > 0 OR SUM(v.total_unique_views) > 0 ORDER BY c.contest_id;