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crosstab function

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postgres 8.2.17

I am trying out the crosstab function (tablefunc contrib) for reporting needs and I'm having a problem. I have customers and products and the data is the quantity purchased. I am grouping by customername, productname in the source sql. My category sql depends if I want the products or customers to be the columns.

When I make customers the rows and products the columns, it works fine. But when I make customers the columns and products the rows, there are duplicate product rows.

Is there a way to group the product rows so that the data results come back correct?

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