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    So... what's a FULL OUTER JOIN then?
    – Amy B
    Commented Jan 2, 2009 at 20:29
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    tableA FULL OUTER JOIN tableB will give you three types of records: all records in tableA with no matching record in tableB, all records in tableB with no matching record in tableA, and all records in tableA with a matching record in tableB. Commented Oct 5, 2009 at 18:16