Display sum from previous year

Question

I have select statement like below:

  select [Fiscal Year], sum([value]), 
         YEAR(DATEADD(year,-1,[Fiscal Year])) as previous_year
  from [table1] 
  group by [Fiscal Year]

How to add after column previous_year, sum([value]) from previous year?

Answer 1

Please try the below query for SQL 2008

select t1.[Fiscal Year],t1.Value,(t1.[Fiscal Year]-1) [previous_year],t2.Value [previous_value]
from  
(  select [Fiscal Year], sum([value]) value
  from [table1] 
  group by [Fiscal Year] 
)t1
LEFT JOIN
(  
select [Fiscal Year], sum([value]) value
  from [table1] 
  group by [Fiscal Year] 
)t2
ON t1.[Fiscal Year]=t2.[Fiscal Year]+1

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