From: | Paul Makepeace <postgresql(dot)org(at)paulm(dot)com> |
---|---|
To: | PostgreSQL Docs <pgsql-docs(at)postgresql(dot)org> |
Subject: | UPDATE FROM syntax |
Date: | 2004-02-23 12:11:05 |
Message-ID: | 20040223121105.GO8784@mythix.realprogrammers.com |
Views: | Raw Message | Whole Thread | Download mbox | Resend email |
Thread: | |
Lists: | pgsql-docs |
Hi, is there any documentation for Pg's UPDATE FROM (apparently
non-standard) syntax? It is mentioned briefly in \h update and not at
all in http://www.postgresql.org/docs/7.3/static/dml-update.html
or http://www.postgresql.org/docs/7.3/static/queries-table-expressions.html
(directly).
[moving a bit OT for docs?]
I solved my own problem but was still curious since it's non-standard if
there's a "more standard" way of updating a table from another query.
ALTER TABLE components ADD COLUMN default_body TEXT;
UPDATE components SET default_body = bb.body
FROM (SELECT b.body, cpb.component_id
FROM componentspagesbodies cpb NATURAL JOIN bodies b
WHERE cpb.page_id IS NULL) AS bb
WHERE bb.component_id = components.component_id;
(Incidently, I tried UPDATE components c SET ... c.component_id but the
parser wasn't happy with it.)
Paul
(PS and now at least one working UPDATE FROM example is online ;-)
--
Paul Makepeace ................................ http://paulm.com/ecademy
"What is it i am yapping about? Three things: location, location,
location."
-- http://paulm.com/toys/surrealism/
From | Date | Subject | |
---|---|---|---|
Next Message | Halley Pacheco de Oliveira | 2004-02-23 18:46:12 | PostgreSQL 7.4 Documentation - perform.sgml |
Previous Message | Henry B. Hotz | 2004-02-21 23:01:04 | Re: Request temporary freeze of libpgtcl chapter in manual |