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Hello - Have you checked Tableau 10 ? In Tableau 10 you can join different database and results can be fetched in Tableau. For now you need a staging database to load both the data and then join and bring in to Tableau. You can do it manually or can take help from any ETL tool like Alteryx.
Tableau 10 won't be able to do UNION though... just JOIN.
Yes you are right, only join.