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Re: Lowest 2 items per

From: "Relyea, Mike" <Mike(dot)Relyea(at)xerox(dot)com>
To: David Johnston <polobo(at)yahoo(dot)com>
Cc: <pgsql-sql(at)postgresql(dot)org>
Subject: Re: Lowest 2 items per
Date: 2012-06-01 15:44:21
Message-ID: (view raw, whole thread or download thread mbox)
Lists: pgsql-sql
> -----Original Message-----
> From: David Johnston [mailto:polobo(at)yahoo(dot)com]
> Sent: Friday, June 01, 2012 11:13 AM
> To: Relyea, Mike
> Cc: <pgsql-sql(at)postgresql(dot)org>
> Subject: Re: [SQL] Lowest 2 items per
> I would recommend using the "RANK" window function with an appropriate
> partition clause in a sub-query then in the outer query you simply
> rank <= 2
> You will need to decide how to deal with ties.
> David J.


I've never used window functions before and rank looks like it'd do the
job quite nicely.  Unfortunately I'm using 8.3 - which I should have
mentioned in my original request but didn't.  Window functions weren't
introduced until 8.4 from what I can tell.


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