The Outer Join can be a powerful tool for querying data in Microsoft Access. When you have only two tables, there is usually no problem. When there are more than two tables, however, using an Outer Join becomes more complicated. Sometimes Access allows it, and sometimes it gives you the not-very-descriptive "Ambiguous Outer Join" error.
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Access 2000 (79 KB): AmbiguousOuterJoins2k.zip
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