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Date: Thu, 04 Sep 2003 21:56:24 +0200
From: Tomasz Myrta <jasiek@klaster.net>
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To: Glenn <gdavy@tpg.com.au>
Cc: pgsql-sql@postgresql.org
Subject: Re: running aggregates
References: <c865c69d.0309011246.5ef4cfb2@posting.google.com>
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> f1    sum_f1  avg_f1  pseudo_recno
> 10	10	10	1
> 20	30	15	2
> 30	60	20	3
> 40	100	25	4
> 50	150	30	5
> 60	210	35	6
> 
> I know I can do this by iterating with a plpgsql routine, but there must
> be a means simply using SQL

select f1
  t1.f1,
  sum(t2.f1) as sum_f1,
  avg(t2.f1) as avg_f1,
  count(*) as pseudo_recno
from
   ttt t1
   join ttt t2 on (t2.f1<=t1.t1)
group by t1.f1
order by t1.f1;

Regards,
Tomasz Myrta