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Santiago

InstantDB currently only supports multiple inner joins in the where clause.
At the moment you can only join two table in the FROM clause. So if you want
to do more than one outer join then I'm afraid InstantDB won't be able to do
it.

Regards

Peter Hearty
Lutris Technologies UK Ltd.
-----Original Message-----
From: Santiago Arriaga <santiago.arriaga@catnet.com.mx>
To: instantdb@enhydra.org <instantdb@enhydra.org>
Date: 29 May 2000 20:37
Subject: InstantDB: multiple outer joins in instantdb


>Does instantdb support doing between more than two tables, or more
>specifically from two tables to a third table?
>
>I've successfully run outer joins between two tables using the following
>syntax:
>
>SELECT areas.ar_num, uperm.up_num
>FROM areas NATURAL LEFT OUTER JOIN uperm
>
>(no where clause, both tables have an ar_num column which holds the keys
>to join both tables).
>
>but when I try to involve a third table with an outer join to the areas
>table, it just doesn't return the results I expect. I've tried
>unsuccessfully syntax like:
>
>SELECT areas.ar_num, uperm.up_num, gperm.gp_num
>FROM areas NATURAL LEFT OUTER JOIN uperm,
>   areas NATURAL LEFT OUTER JOIN gperm
>
>or even things like:
>
>SELECT a.ar_num, uperm.up_num, gperm.gp_num
>FROM areas a NATURAL LEFT OUTER JOIN uperm,
>   areas b NATURAL LEFT OUTER JOIN gperm
>WHERE a.ar_num = b.ar_num
>
>Is what I'm trying to do supported? If so, which is the correct syntax?
>
>thanks in advance
>
>Santiago
>
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