How can I calculate the time between registration to first time deposit?
You want to know what is the time, in days, that has past from a certain user's signup to their first deposit.
select avg(time_between_in_days) time_between_in_days from
(select customer_user_id ,su_date,ftd_date ,datediff( ftd_date,su_date) as time_between_in_days from accounts)
