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@postgresql.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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