running total for N days with mysql - mysql

Question

i have a table that looks like this :
what i need is For each day show the accumulated (moving) number of new Droppers in the last 5 days inclusive
Split to US vs. Non-US geos.
Report Columns:
DataTimstamp - upper boundary of a 5-day time frame
Total - number of New Droppers within the time frame
Region_US - number of New Droppers where country =’US’
Region_rest - number of New Droppers where country<>’US’
this is my code :
Create view new_droppers_per_date as Select date,country,count(dropperid) as num_new_customers
From(
Select dropper id,country,min(cast( LoginTimestamp as date)) as date
From droppers) as t1 group by date,country
Select DataTimstamp,region_us,region_rest from(
(Select date as DataTimstamp ,sum(num_new_customers) over(oreder by date range between 5
preceding and 1 preceding) as total
From new_droppers_per_date ) as t1 inner join
(Select date ,sum(num_new_customers) over(oreder by date range between 5 preceding and preceding)
as region_us
From new_droppers_per_date where country=”us”) as t2 on t1.date=t2.date inner join
(Select date, sum(num_new_customers) over(oreder by date range between 5 preceding and 1
preceding)
as region_rest
From new_droppers_per_date where country <>”us”) as t3 on t2.date=t3.date)
i was wondering if there is any easier\smarter way to do so without using so many joins and view
thank you for the help:)

Answer 1

Here is one way to do it using window functions. First assign a flag to the first login of each DropperId, then aggregate by day and count the number of new logins. Finally, make a window sum() with a range frame that spans over the last 5 days.
select
LoginDay,
sum(CntNewDroppers) over(
order by LoginDay
range between interval 5 day preceding and current row
) RunningCntNewDroppers
from
select
date(LoginTimestamp) LoginDay,
sum(rn = 1) CntNewDroppers
from (
select
LoginTimestamp,
row_number() over(partition by DropperId order by LoginTimestamp) rn
from mytable
) t
) t