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There are a couple of possibilities:
- You can rank in Tableau Prep using a method like this: Rank and Ranking in Tableau Prep | VizPainter.
- If your database allows for Custom SQL in Tableau Prep, then you could write a SQL script that either selected the top 25 corporations. You could then inner join in either the SQL script or Tableau Prep flow to keep only those records.
- If your database allows for Custom SQL and also has some kind of Row_Number() function, you could use that to rank the rows.
I'm hoping the functionality here (please vote!) to be implemented in a future release as it could be used to solve this kind of issue too.
Hope that helps!