SQL Server :: Combine Two Rows Of Data?

have a complex sql stored procedure which involves several unions.The unions also involveat from views. When the data is returned, it might look like the following.

ProductId Name Amount Buyer Date YearsAsCustomer
1 Jones 234.44 Nichols
1 Jones 3/12/2011 3
2 Melon 333.00 Tripol
2 Melon 3/23/2011 4

This is just a simple example, but notice how the records with the same product Id can be combined?Because one record has some of the data I need and the other record has different data. So essentiallythey should just be in one record together. So the output should look like this:

ProductId Name Amount Buyer Date YearsAsCustomer
1 Jones 234.44 Nichols 3/12/2011 3
2 Melon 333.00 Tripol 3/23/2011 4

How can I combine these records together? In the stored procedure the query is build in a parameter stringnamed @SQL, and then the query is executed by using the EXEC command:EXEC sp_executesql @SQL.Is their anway I can combine all of the outputted records into one record. Where the records I want to combine
have the same ProductId (As in the example I illustrated above?)