SQL - Running Total - Year To Date, Previous Year To Date, and Last Rolling 12 Months

Question

Thanks for helping me out with this one! I apologize in advance for the formatting, but I think it is easy to follow.

Provided is a sample table of data. I need three

Answer 1

VKP Raised a valid point. If missing months, we would need to fill.

The following will generate your running total columns.

Example

Select *
      ,Running12       = sum(Value) over (Partition By ID Order By Date Rows Between 11 Preceding and Current Row)
      ,CalendarYTD     = sum(Value) over (Partition By ID,Year(Date) Order By Date)
      ,PrevCalendarYTD = case when month(date)<>1 then null else (Select Value from @YourTable Where ID=A.ID and date=dateadd(year,-1,A.date)) end
 From @YourTable A
 Order By ID,Date

Returns