Message-ID: <45D73CCD.6080203@gmail.com>
Date: Sat, 17 Feb 2007 18:35:09 +0100
From: "M.P.Dankoor" <m.p.dankoor@gmail.com>
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To: pgsql-sql@postgresql.org
Subject: Re: sub-limiting a query
References: <20070217125634.GA20589@apartia.fr>
In-Reply-To: <20070217125634.GA20589@apartia.fr>
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Louis-David Mitterrand wrote:
> Hello,
>
> I've got a table of shows with different types (movie, theater, 
> ballet,etc.) and I am looking for a select that can return the 10 last 
> entered shows AND at most 2 of each type. Is that possible in one query?
>
> The table looks basically like:
>
> 	created_on      | timestamp without time zone 
> 	show_name       | text 
> 	id_show         | integer                     
> 	show_type       | text                        
> 	id_show_subtype | integer                     
>
> ---------------------------(end of broadcast)---------------------------
> TIP 2: Don't 'kill -9' the postmaster
>
>   

Looks like a top n query and whilst there are many top-n query solution 
I'd refer you to a Joe Celko solution.
Check the "top salesperson contest" and I think you should be able to 
work your problem (http://www.dbmsmag.com/9610d06.html)

Mario