그동안 숙제로 했던 코드들 SELECT * FROM point_users; SELECT * FROM orders; SELECT * FROM point_users pu INNER JOIN orders o on pu.user_id = o.user_id; SELECT payment_method, round(AVG(point)) FROM point_users pu INNER JOIN orders o on pu.user_id = o.user_id GROUP BY payment_method; SELECT * from enrolleds; SELECT * from users; SELECT name, count(*) as cnt from enrolleds e inner join users u on e.user_id = ..