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Message-ID: <20060707155924.93209.qmail@web31806.mail.mud.yahoo.com>
Date: Fri, 7 Jul 2006 08:59:24 -0700 (PDT)
From: Richard Broersma Jr <rabroersma@yahoo.com>
Subject: Re: create aggregate function 'count_bool( column_name, boolean )'
To: James Moliere <jmoliere@ucsd.edu>, pgsql-sql@postgresql.org
In-Reply-To: <005b01c6a1cc$c43de9b0$0302a8c0@intelesis.org>
MIME-Version: 1.0
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> so now I can create the statement
> select distict product_id, count_bool(purchased, true),
> count_bool(was_selected, true) from some_table group by product_id;
> 
> instead of breaking the query into 3 seperate queries
> 
> select distict product_id from some_table;
> select count(purchased) from product_id where purchased = true;
> select count(was_selected) from some_table where was_selected = true;
> Am I missing a detail with SQL based aggregate function development?
> Any help would be appreciated.

how about:

select 
    product_id, 
    (
      select count(purchased)
      from some_table as A2
      where purchased=true and A1.product_id=A2.product_id
    ) as TP,
    (
      select count(selected)
      from some_table as A3
      where purchased=true and A1.product_id=A3.product_id
    ) as TS
from
  some_table as A1
group by
  product_id;

Regards,

Richard Broersma Jr.