Microsoft Office Tutorials and References
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Resolving ambiguous outer joins
Resolving ambiguous outer joins
When you join tables together on a query and you have a
line without any arrows at either end, you have an equally
matched join (sometimes called an INNER JOIN or simply
a JOIN). In the earlier parts of this section, we displayed
unmatched records and missing parent records by adding
an arrow at one end of the join; this is called an OUTER JOIN
(being LEFT or RIGHT depending on which end all records
are being displayed from). If you add tables to a query where
you have already specified OUTER JOINS in the relationships,
these will be shown by default when you add the tables to
the query grid.
If you have a mixture of join types when you try to run a
query, you will be warned that you have a join ambiguity, as
shown here.
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