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Date: Tue, 24 Jun 2003 10:01:20 +0200
From: Tomasz Myrta <jasiek@klaster.net>
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To: pgsql-sql@postgresql.org
Cc: Ryan <pgsql-sql@seahat.com>
Subject: Re: aggregate question
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Dnia 2003-06-24 00:04, Użytkownik Tomasz Myrta napisał:
>

> select package_name,
>  count(*) as n_packages
> from
>  packages
>  join package_log using (package_id);
> 

> And one more:
> select package_name,
>  sum(case when package_log.package_id is not null then 1 else 0 end)
>    as n_packages
> from
>  packages
>  left join package_log using (package_id);

Add "group by package_name" to these queries...
Tomasz