Re: UPDATE and outer joins - Mailing list pgsql-general

From Harry Broomhall
Subject Re: UPDATE and outer joins
Date
Msg-id 200310101321.OAA30662@haeb.noc.uk.easynet.net
Whole thread Raw
In response to Re: UPDATE and outer joins  (Manfred Koizar <mkoi-pg@aon.at>)
List pgsql-general
Manfred Koizar writes:
> On Wed, 8 Oct 2003 12:23:04 +0100 (BST), Harry Broomhall
> <harry.broomhall@uk.easynet.net> wrote:
> >I am currently
> >doing a left outer join into a temporary file, then the UPDATE, but this
> >involves two joins!
>
>     UPDATE a
>        SET col1 = b.col11, col2 = b.col12
>       FROM a AS x LEFT JOIN b ON (x.??? = b.???)
>      WHERE a.pk = x.pk;
>
> might not run faster, but at least it is only one statement and you
> don't have to care for temporary tables ...


   Many thanks to all who made suggestions.  The above gave me enough
clues to get a working UPDATE query working.

   It is a shame it can't be done in a single join though!

   Regards,
       Harry.

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