>I have a clients table and a locations table. Each client has and address that is in the locations table. I want to join the clients table to the locations table so I can replace the address in the clients table with the key to that address in the locations table.
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>For the most part, there is only one of each address in the locations table. But because I'm working with bad data, there might be more than one.
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>Is there a join that will take one and only one of each client and match it up to the first address in locations that it finds, and doesn't make a second entry of the same client for the second address in locations?
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If you don't mind doing a two stage query.

SELECT * FROM locations GROUP BY id GROUP BY ID INTO CURSOR locations2
SELECT clients.*, locations2.address FROM clients, locations WHERE clients.id = locations2.id INTO CURSOR clientloc

ID is the unique key between the two tables.