Re: How do you select from a table until a condition is met?
От | Nicholas Allen |
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Тема | Re: How do you select from a table until a condition is met? |
Дата | |
Msg-id | 200302122153.08970.nallen@freenet.co.uk обсуждение исходный текст |
Ответ на | Re: How do you select from a table until a condition is met? (Bruno Wolff III <bruno@wolff.to>) |
Ответы |
Re: How do you select from a table until a condition is met?
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Список | pgsql-sql |
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
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