Re: [GENERAL] a JOIN on same table, but 'slided over'

From: Gurjeet Singh <singh.gurjeet(at)gmail.com>
Date: Tue Jun 26 2007 - 08:35:46 EDT

Hi Rafal,

    Just a note that this is not standard SQL... 'distinct on' is an extension to SQL provided by postgres.

Following query utilizes the standard SQL to get the same results:

select t1.id as id, t2.id as "id+1",

        t1.thread as thread, t2.thread as "thread+1",
        t1.info as info, t2.info as "info+1"

from test as t1, test as t2
where t2.id = ( select min(id) from test as t3 where t3.id > t1.id);

HTH

-- 
gurjeet[.singh]@EnterpriseDB.com
singh.gurjeet@{ gmail | hotmail | indiatimes | yahoo }.com

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Sent from my BlackLaptop device

On 6/26/07, Rafal Pietrak  wrote:

>
> Marvelous! Thenx!
>
> -R
>
> On Tue, 2007-06-26 at 10:06 +0200, hubert depesz lubaczewski wrote:
> > On 6/26/07, Rafal Pietrak <rafal@zorro.isa-geek.com> wrote:
> >         Is there an SQL construct to get it?
> >
> > select
> >     distinct on (t1.id)
> >     t1.*, t2.*
> > from
> >     test t1
> >     join test t2 on t2.id > t1.id
> > order by t1.id asc, t2.id asc
> >
> > should do the trick.
> >
> > depesz
> >
> > --
> > http://www.depesz.com/ - nowy, lepszy depesz
>
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Received on Tue Jun 26 08:37:01 2007