Date split-up based on Fiscal Year

Question

Given a From Date, To Date and a Fiscal Year system, I want to get all the split-up duration within the given From & To Date based on the Fisc

Answer 1

You could create a table containing the start and end of all fiscal years, f.e.

Periods (PeriodStartDt, PeriodEndDt)

Then you can join the tables together if they at least partly overlap. Use a case statement to select the end of the period or the end of the row, depending on which is later. For example (not tested):

select      case when yt.StartDt < p.PeriodStartDt then p.PeriodStartDt
                 else yt.StartDt
            end as SplitStart
,           case when yt.EndDt > p.PeriodEndDt then p.PeriodEndDt
                 else yt.EndDt
            end as SplitEnd
,           yt.*
from        YourTable yt
inner join  Periods p
on          yt.StartDt < p.PeriodEndDate
            and yt.EndDt >= p.PeriodStartDate