Question

I am trying to find the difference in a single column data i.e. the Different would be

Column C
date 2 (1/2/12) would check the difference from date 1 (1/1/12)
date 3 (1/3/12) would check the difference from date 2 (1/2/12)
date 4 (1/4/12) would check the difference from date 3 (1/3/12)

I think i could create two other columns Date days minus -1 and amount then display the difference

Column A<date>  Column B<Amount> Column C <Difference>
1/1/12            550             -150
1/2/12            400              300
1/3/12            700             -200
1/4/12            500

Thanks for your help

Answer 1

you can use LEAD analytic function

SELECT  "Column A", 
        "Column B",
        (LEAD("Column B", 1) OVER (ORDER BY "Column A") - "Column B") AS "Difference"
FROM    TableName

• SQLFiddle Demo

Other(s)

• LAG and LEAD Analytic Functions