Assume that you have a query that use some ranking functions, such as the ROW_NUMBER() function. When you run the query against a table in Microsoft SQL Server 2008, you may receive an incorrect result when a parallel execution plan is used for the query.
Note This issue has been fixed in Microsoft SQL Server 2008 R2 Service Pack 1 (SP1) and later versions.
The issue was first fixed in the following cumulative update of SQL Server.
Each new cumulative update for SQL Server contains all the hotfixes and all the security fixes that were included with the previous cumulative update. Check out the latest cumulative updates for SQL Server: