Re: How do you select from a table until a condition is met?

From: Nicholas Allen <nallen(at)freenet(dot)co(dot)uk>
To: Bruno Wolff III <bruno(at)wolff(dot)to>
Cc: Dmitry Tkach <dmitry(at)openratings(dot)com>, pgsql-sql(at)postgresql(dot)org
Subject: Re: How do you select from a table until a condition is met?
Date: 2003-02-12 20:53:08
Message-ID: 200302122153.08970.nallen@freenet.co.uk
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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(at)freenet(dot)co(dot)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.
>
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