select round((select count(distinct l1.user_id)
from login l1
inner join login l2
on datediff(l2.date,l1.date)=1 and l1.user_id=l2.user_id
inner join(
select min(date) min_date,user_id
from login
group by user_id
) t
on l1.date=t.min_date and l1.user_id=t.user_id)/count(distinct user_id),3) p
from login;