Not sure how your representation of dates work, but you might try something like

select month,sum(amount) from <yourtable> group by month

Hope this helps.

>What Logic should I use to compare Data for One Month to another ?
>
>
>My Table contains following fileds.
>
>Accountno N (10) && example 1234567891
>Month N (8,2) && 2013.10 represents Jan,2013.91 Represents October
>Invoice N (14) & Amount N(10)
>
>I have been asked to compare the Monthly Amounts with the preceding months Amount. Also Compare one year to another.
>
>What logic should I use, How to start up with this.