From: Nicholas Allen <nallen@freenet.co.uk>
To: Bruno Wolff III <bruno@wolff.to>
Cc: Dmitry Tkach <dmitry@openratings.com>
Cc: pgsql-sql@postgresql.org
Subject: Re: How do you select from a table until a condition is met?
Date: Wed, 12 Feb 2003 21:53:08 +0100
Message-ID: <200302122153.08970.nallen@freenet.co.uk> (raw)
In-Reply-To: <20030212203749.GA30483@wolff.to>
References: <200302121910.38232.nallen@freenet.co.uk>
<200302122055.21790.nallen@freenet.co.uk>
<20030212203749.GA30483@wolff.to>
Ok I thought of that but what happens if there is no primary key in the table?
I can probably add primary keys to the table but I didn't design the tables
and so I have little (but luckily some) say over what columns appear in them.
What has actually happened is that we have a view on a table and the view
doesn't return the primary key. I'll try and ask the database administrator
to add the primary keys.
Thanks for the help though I guess it is the only way to do it. I was just
hoping there would be a way to do it without a promary key to prevent changes
to our database views.
On Wednesday 12 Feb 2003 9:37 pm, Bruno Wolff III wrote:
> On Wed, Feb 12, 2003 at 20:55:21 +0100,
>
> Nicholas Allen <nallen@freenet.co.uk> wrote:
> > I thought of this but the problem is that there may be multiple rows with
> > the same value for the column I am sorting on. Eg if sorting on a surname
> > then there may be 100s of people with the same surname so generating a
> > where clause that selects up to the exact person previously selected is
> > very difficult.
>
> Then you should sort on surname AND whatever you are using as the primary
> key.
>
> ---------------------------(end of broadcast)---------------------------
> TIP 1: subscribe and unsubscribe commands go to majordomo@postgresql.org
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Reply to all the recipients using the --to and --cc options:
reply via email
To: pgsql-sql@postgresql.org
Cc: nallen@freenet.co.uk, bruno@wolff.to, dmitry@openratings.com
Subject: Re: How do you select from a table until a condition is met?
In-Reply-To: <200302122153.08970.nallen@freenet.co.uk>
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
This inbox is served by DDX for PostgreSQL; see mirroring instructions
for how to clone and mirror all data and code used for this inbox