SELECT COUNT(pu.point_user_id),  

    COUNT(u.user_id)  

  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'

이거 왜 에러뜰까요..