sql server 2005 - How to add Row_number to table function results -

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I have a function that gives a group (cluster) from a table. 

  Create function dbo.ftAllClusters () Select the different cluster from the company as the return table in the form of the return

Now I need to add the line number for each line .. < / P> 

  select cluster, ROW_NUMBER () over (order of cluster) AS RowNo FROM (related to company Select cluster) x

... 

  select cluster, ROW_NUMBER () over (order of cluster) AS RowNo FROM COMPANY GROUP by cluster

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