/* SELECT u.name, sum(info.grade_num) as grade_sum from user as u right JOIN grade_info as info ON u.id = info.user_id GROUP BY info.user_id */ SELECT t.name, t.grade_sum FROM (SELECT u.name as name, sum(info.grade_num) as grade_sum from user as u right JOIN grade_info as info ON u.id = info.user_id GROUP BY info.user_id) as t ORDER BY grade_sum DESC limit 1;