SQL Sum of last X Sum of records

Question

I\'ve looked for a while and I cannot find the answer to this question (maybe I\'m not searching the correct terms or something). Basically, I have a database that has any n

Answer 1

Here is an idea using correlated subqueries:

with bydays as ()
select bd.*,
       (select sum(NumMeasured) from (select top 100 * from bydays bd2 where bd2.date <= bd.date order by date desc) t
       ) as Measured100,
       (select sum(NumPassingd) from (select top 100 * from bydays bd2 where bd2.date <= bd.date order by date desc) t
       ) as Measured100
from bydays