From: Gary Stainburn <gary.stainburn@ringways.co.uk>
To: Stephan Szabo <sszabo@megazone.bigpanda.com>
Cc: pgsql-sql@postgresql.org
Subject: Re: update from select
Date: Wed, 29 Oct 2003 15:36:30 +0000
Message-ID: <200310291536.30447.gary.stainburn@ringways.co.uk> (raw)
In-Reply-To: <20031029065413.C97497@megazone.bigpanda.com>
References: <200310290911.54453.gary.stainburn@ringways.co.uk>
<20031029065413.C97497@megazone.bigpanda.com>
On Wednesday 29 Oct 2003 2:58 pm, Stephan Szabo wrote:
> 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?
Thanks for this Stephan,
although the vowner is not unique, the update has worked sufficantly.
Gary
>
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--
Gary Stainburn
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To: pgsql-sql@postgresql.org
Cc: gary.stainburn@ringways.co.uk, sszabo@megazone.bigpanda.com
Subject: Re: update from select
In-Reply-To: <200310291536.30447.gary.stainburn@ringways.co.uk>
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