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Dirk

You can do three way joins in the WHERE clause with InstantDB, but
unfortunately, joins in the FROM clause are limited to only two tables. This
is mainly because I had assumed that the FROM clause would mainly be used
for OUTER joins, and InstantDB currently limits outer joins to just two
tables.

It's *supposed* to generated a slightly friendlier message than "Table not
found: null" to make this clear. I'll have a look at why it doesn't.

Regards

Pete

--

Peter Hearty                         peter.hearty@lutris.com
Lutris Technologies (UK)        http://www.lutris.com
----- Original Message -----
From: "Dirk Jesko" <jesko@iti.CS.Uni-Magdeburg.De>
To: <instantDB@enhydra.org>
Sent: Monday, October 16, 2000 9:13 AM
Subject: InstantDB: How to join three or more tables?


> Hello,
>
> InstantDBs SQL-Syntax allows joins with more than two tables, but
> executing a Query like:
>
> SELECT * FROM (t1 inner join t2 on t1.id=t2.t1id) inner join t3 on
> t2.id=t3.t2id
>
> results in the following SQL-Exception:
>
> java.sql.SQLException: Table not found: null
>
> I tried some other versions, e.g. with alias names for the tables,
> setting the  parenthesis differently, but it does not help.
> Querying the tables without using JOIN, like in:
>
> SELECT * FROM t1, t2, t3 WHERE t1.id=t2.t1id AND t2.id=t3.t2.id
>
> works fine.
>
> What is wrong with the query using the JOIN-Statement?
>
> Thanks,
> Dirk
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