Data Federator:  Unioning Multiple Tables into single view possible?

Hi,
I have three different databases with tables containing a portion of the same kind of data and I want to union the three different tables together in Data Federator to present a single logical view that has the complete set of data.  Is this possible in Data Federator?  How would I go about doing that?
Note: I do not have keys to join the tables together on since it's not simply extending the data in one table with additional data in another table and doing an inner join on a unique key.  Instead, for example, there's a customer table for Finance, a customer table for Operations and a customer table for Sales and they all contain the same columns (with maybe slightly different names) and same type of data.  I want to effectively union Finance, Operations and Sales together in a federated/virtualized view so applications can just query from that view to get all the customers from the three different databases.
I have been unable to do this so far since Data Federator requires each table in a mapping to have a relationship with the other tables in the mapping.
Thanks for the help.
Kerby

I figured out the original question using one mapping for each table but have a new question now. 
Is it possible for an application to use the combined view from Data Federator to write back into the databases?
e.g. have an application use the target table in Data Federator and view the results, and based on that update the data in the underlying database that provides the data for the target table?
Thanks for the help.
Kerby

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