SELECT COUNT(pu.point_user_id) as pnt_user_cnt,

COUNT(u.user_id) as tot_user_cnt

round(COUNT(pu.point_user_id)/COUNT(u.user_id),2) as ratio

FROM users u 

left join point_users pu 

on u.user_id = pu.user_id 

WHERE u.created_at BETWEEN '2020-07-10' and '2020-07-20'

round 부분에서 오류가 있다고 하는데 뭐가 잘못된건가요