From: Stephan Szabo <sszabo@megazone.bigpanda.com>
To: Gary Stainburn <gary.stainburn@ringways.co.uk>
Cc: pgsql-sql@postgresql.org
Subject: Re: update from select
Date: Wed, 29 Oct 2003 06:58:42 -0800 (PST)
Message-ID: <20031029065413.C97497@megazone.bigpanda.com> (raw)
In-Reply-To: <200310290911.54453.gary.stainburn@ringways.co.uk>
References: <200310290911.54453.gary.stainburn@ringways.co.uk>
On Wed, 29 Oct 2003, Gary Stainburn wrote:
> Hi folks,
>
> don't know if it's cos of the 17 hours I've just worked (sympathy vote please)
> but I can't get this one worked out
>
> I've got table names with nid as name id field and nallowfollow flag.
> I've got a vehicles table with vowner pointing at nid and a vallowfollow
> field.
>
> How can I update nallowfollow from the appropriate vallowfollow flag?
If vehicles.vowner is unique, something like this maybe (using extensions
to sql)?
update names set nallowfollow=vehicles.vallowfollow
from vehicles where vehicles.vowner=names.nid;
I think it'd be the follwoing in straight sql:
update names set nallowfollow=
(select vallowfollow from vehicles where vehicles.vowner=names.nid);
If it's not unique, what do you do if there are two vehicles with the same
vowner and different values for vallowfollow?
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To: pgsql-sql@postgresql.org
Cc: sszabo@megazone.bigpanda.com, gary.stainburn@ringways.co.uk
Subject: Re: update from select
In-Reply-To: <20031029065413.C97497@megazone.bigpanda.com>
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