Saving Sql Server data saved in a datawindow

I have a datawindow, that's pulling some data from a sql server database.

But... on the exported file, one of the columns needs to be a counter of the row.

It's harder to produce a row # in sqlserver... And... doing a saveas only

saves the data that was produced from the Query, and not the computed fields in the datawindow

Does anyone have any ideas?

What makes this worse, is I have to do a Union of 2 queries.

Select  *

   from  XXXX

   where audit = 'F300000'

Union

Select *

   from YYYY

   where audit = 'F300000'

I think I need to do something like this

Select row_number() over (), *

(select *

   from XXXX

union

Select *

   from YYYY)  test

where test.audit = 'F30000'

Is there any easier way to do this?   can computed fields be saved to the excel file?