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Crystal Reports percent change in rolling months

Crystal Reports percent change in rolling months

I've got two categories that I need to show totals for the previous 6 months. The tricky part is I need to show the change from one month to the next in a percentage. I think I've got my Select Expert set to show a rolling 6 months: {table.mydate} >= DateAdd("M",-6,CurrentDate()) and {table.mydate} <= CurrentDate()

I've grouped by month, and then added a group by category. I did a count of orders for each category, which looks like this:

Apples - 20
Oranges - 15

Apples - 25
Oranges - 10

To get the percent change for Apples from May to June, I would need to do (25-20)/25*100, which would get me 20%. Oranges would get me -50%.

Ideally, this would be a crosstab. I've tried using Previous, but that doesn't work with groups. This is my goal:

May %Change June %Change July %Change
Apples 20 0% 25 20% 31 19%
Oranges 15 0% 10 -50% 17 41%

Any ideas on how to accomplish that? Thanks!

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