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Re: [SQL] need ``row number``

From: Greg Stark <gsstark(at)mit(dot)edu>
To: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
Cc: Karsten Hilbert <Karsten(dot)Hilbert(at)gmx(dot)net>,pgsql-general(at)postgresql(dot)org, pgsql-sql(at)postgresql(dot)org
Subject: Re: [SQL] need ``row number``
Date: 2004-09-24 20:34:47
Message-ID: 87ekkr9ziw.fsf@stark.xeocode.com (view raw or flat)
Thread:
Lists: pgsql-generalpgsql-sql
Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> writes:

> Karsten Hilbert <Karsten(dot)Hilbert(at)gmx(dot)net> writes:
> > I am not convinced I'll need a SRF. I am not trying to
> > calculate something that isn't there yet. I am just trying to
> > join two views appropriately. I might have to employ some
> > variant of Celko's integer helper table but I'm not sure how
> > to proceed.
> 
> A fairly common hack for this is to use a sequence:
> 
> 	create temp sequence tseq;
> 	select nextval('tseq'), * from (select .... order by ...) ss;

But I thought she wanted to get the row number within a group. Not the row
number for the entire result set. A sequence can't do that. Or at least, I
suppose it could but it would be mighty strange to see setval() in a SELECT
query. And I can't think of how to detect the level break in a select query
either.

-- 
greg


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