Consolidating multiple rows to a single row - reportingservices-2005

Question

Is it possible to join multiple row values to a single row? The stored procedure from where I acquire the data that I use return multiple, almost identical rows except that the category-column dfferentiates for products that have been assigned multiple categories. I would like to consolidate these categories to one column, separated by new lines. Example data:
Name Article number Sales Sales Category
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Product 1 2059102-1 20520 Retailer 1
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Product 1 2059102-1 20520 Retailer 2
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Product 1 2059102-1 20520 Retailer 3
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Product 2 2059102-2 2050 Retailer 1
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Product 2 2059102-2 5302 Retailer 3
Desired result:
Name Article number Sales Sales Category
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Product 1 2059102-1 20520 Retailer 1
Retailer 2
Retailer 3
------------------------------------------------
Product 2 2059102-2 2050 Retailer 1
Retailer 3
Thank you!

Answer 1

Create an RDL table and setup a Grouping on the Detail section of the table with two grouping expressions (so you have a single Grouping in the Table Details, but with multiple grouping expressions). The grouping expressions should be one for each of the fields: Name, Article number.
Then put a column in the RDL table for each field (Name, Article number, Sales, Sales Category). The trick is putting a List control in the Sales Category cell. In the list add a textbox for the "Sales Category" field and I think you'll get the result you want.
There is also some nasty SQL tricks for "row concatenation", but that is not very maintainable IMHO.