SELECT user.name, SUM(grade_num) OVER( PARTITION BY user_id ) AS total_num FROM grade_info JOIN user ON grade_info.user_id = user.id WHERE type = 'add' ORDER BY total_num DESC LIMIT 1
SELECT user.name, SUM(grade_num) OVER( PARTITION BY user_id ) AS total_num FROM grade_info JOIN user ON grade_info.user_id = user.id WHERE type = 'add' ORDER BY total_num DESC LIMIT 1