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    SELECT A.CONTEST_ID, A.HACKER_ID, A.NAME, SUM(TOTAL_SUBMISSION) AS TOTAL_SUBMISSIONS, SUM(TOTAL_ACCEPTED_SUBMISSION) AS TOTAL_ACCEPTED_SUBMISSIONS, SUM(TOTAL_VIEW) AS TOTAL_VIEWS, SUM(TOTAL_UNIQUE_VIEW) AS TOTAL_UNIQUE_VIEWS FROM CONTESTS AS A LEFT JOIN COLLEGES AS B ON A.CONTEST_ID = B.CONTEST_ID LEFT JOIN CHALLENGES AS C ON B.COLLEGE_ID = C.COLLEGE_ID LEFT JOIN (SELECT CHALLENGE_ID, SUM(TOTAL_VIEWS) AS TOTAL_VIEW, SUM(TOTAL_UNIQUE_VIEWS) AS TOTAL_UNIQUE_VIEW FROM VIEW_STATS GROUP BY CHALLENGE_ID) AS D ON C.CHALLENGE_ID = D.CHALLENGE_ID LEFT JOIN (SELECT CHALLENGE_ID, SUM(TOTAL_SUBMISSIONS) AS TOTAL_SUBMISSION, SUM(TOTAL_ACCEPTED_SUBMISSIONS) AS TOTAL_ACCEPTED_SUBMISSION FROM SUBMISSION_STATS GROUP BY CHALLENGE_ID) AS E ON C.CHALLENGE_ID = E.CHALLENGE_ID GROUP BY A.CONTEST_ID, A.HACKER_ID, A.NAME HAVING (TOTAL_SUBMISSIONS + TOTAL_ACCEPTED_SUBMISSIONS + TOTAL_VIEWS + TOTAL_UNIQUE_VIEWS) > 0 ORDER BY A.CONTEST_ID;