SELECT
    E.USER_ID,
    SUM(S.POINT),
    STRFTIME('%S', MAX(S.SUBMITTED_AT)) - STRFTIME('%S', E.STARTED_AT)
FROM
    ENTRIES E
    LEFT JOIN SUBMISSIONS S
        ON S.ENTRY_ID = E.ENTRY_ID
        AND E.CONTEST_ID = 2
WHERE
    S.STATUS = 'AC'
GROUP BY
    E.USER_ID
;