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split data set values into 2 rows

Posted By:      Posted Date: April 14, 2011    Points: 0   Category :
I have a dataset that contains my customer sales entries for all months over the past 24 months. I would like to set up my report in a way so that the sales by month in the current year show on the first line of my report and the sales by month of the previous year show on the second line , so the months from year to year can be easily compared.
My data set results look like this:

Customer     Date     Sales
Joe Smith 2011-02 120.50
Joe Smith 2011-02 144.55
Jane Doe 2011-02 111.20
Joe Smith 2011-03 220.20
Joe Smith 2011-04 130.60

I've build a matrix report that summarizes the sales for each month by customer

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