Question

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Need help with a SQL query that combines adjacent rows into a single row

So this is how my table looks.

..and I need to write a query to get the output like this:

This is not a homework question.

Answer 1

The following answer is only valid for SQL Server 2005+:

  SELECT t.category,
         STUFF((SELECT ','+ x.prod
                  FROM TABLE x
                 WHERE x.category = t.category
              GROUP BY x.prod
               FOR XML PATH('')), 1, 1, '') AS prod,
         SUM(t.price) AS amt
    FROM TABLE t
GROUP BY t.category