Re: need nelp with aggregate functions

Try substituting the SELECT count(c) as qtd_client,count(cm) as qtd_computers

by

SELECT count( DISTINCT c.cliente_id) as qtd_client,count(/* put here the primary key of the computer table */ ) as qtd_computers

Then tell me if it output what you want

Best,
Oliveiros

----- Original Message -----
From: Another Trad
To: pgsql-sql(at)postgresql(dot)org
Sent: Wednesday, November 18, 2009 4:55 PM
Subject: [SQL] need nelp with aggregate functions

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?

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