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Date: Wed, 18 Nov 2009 10:07:59 -0700
Message-ID: <dcc563d10911180907vff9977ehf7352781340ea78f@mail.gmail.com>
Subject: Re: need nelp with aggregate functions
From: Scott Marlowe <scott.marlowe@gmail.com>
To: Another Trad <anothertrad@gmail.com>
Cc: pgsql-sql@postgresql.org
Content-Type: text/plain; charset=ISO-8859-1

On Wed, Nov 18, 2009 at 9:55 AM, Another Trad <anothertrad@gmail.com> wrote:
> The DB structure is in attachment.
> I with the number of clients and the number of computers that have
> processors with "manufacturer" = "INTEL" and "speed" = "2GB"
> I am trying:
>
> select count(c) as qtd_client, count(cm) as qtd_computers
>
>   from cliente c
>   inner JOIN computer cm on (c.cliente_id = cm.cliente_id)
>   inner join processor p on (cm.processor_id = p.processor_id)
> inner join speed s on (s.speed_id = p.speed_id)
> INNER JOIN manufacturer m on (p.manufacturer_id=m.manufacturer_id)
>
> where m.manufacturer = 'INTEL'
> and s.speed = '2GB'
>
> but is not working
> anyone can help me?

If you are getting an error message it's a good idea to post it as well.

However, first problem is that c and cm are tables, not fields.  You
need to count some field from those tables.