Calculating value using previous value of a row in T-SQL

Question

I got following table and want to calculate value of Column2 on each row using the value of the same column (Column2) from the previous row in a sql without using cursor or

Answer 1

edit: shoudld have read the question better...

Another go woudl be this:

;with DataRaw as (
    select 1 as Id, '01/01/11' as Date, 5 as Column1 union
    select 2 as Id, '02/01/11' as Date, 2 as Column1 union
    select 4 as Id, '03/01/11' as Date, 3 as Column1
),
Data as (
    select Ord = ROW_NUMBER() over (order by Id), Id, Date, Column1 from DataRaw
),
select -- formula goes here, using current and prev as datasources.
from  data current
      left join data prev on current.Ord = prev.Ord + 1  -- pick the previous row by adding 1 to the ordinal

I think a normal join to get to the previous row would be faster than a CTE. You;d have to check for yourself though.

Looks easier to me.

Good luck, GJ