Re: Multiple outer join on same table - Mailing list pgsql-sql

On Пнд, 2004-02-09 at 19:12 +0100, Marco Lazzeri wrote:
> Hi!
> I'm searching a better (quicker) way to retrieve data as I used to do
> using the following query...
>
> ==
> SELECT
>     main.codice,
>     other.value AS value_one,
>     other.value AS value_two
> FROM main LEFT OUTER JOIN other                        ON main.id =
> other.id_main
>                       LEFT OUTER JOIN other AS other2 ON main.id =
> other2.id_main
> WHERE
>         other.type = 'type_one'
> AND other2.type = 'type_two';
> ==

You can alias a table to join it to itself. I'm not sure whether that
answers your question.

SELECT t1.field FROM table AS t1 JOIN table as t2 on (cond)

--
Markus Bertheau <twanger@bluetwanger.de>