Re: How to re-sort a sorted query?

On Tue, 2004-10-26 at 17:43 -0400, Tom Lane wrote:
> Oliver Elphick <olly@lfix.co.uk> writes:
> > On Tue, 2004-10-26 at 14:23 -0500, Yudie wrote:
> >> Then I do this query to get unique store number and also the cheapest
> >> price from each store:
> >> 
> >> SQL= "Select distinct on (storenumber), itemsku, storenumber,price
> >> from storeproduct where itemsku='10001' 
> >> order by storenumber, price"
> 
> > That won't get you the cheapest price,
> 
> Sure it will.  It's a perfectly good application of DISTINCT ON.
> However, he has to use that particular ORDER BY to get the answers
> he wants.

Ah - because ORDER BY is applied before DISTINCT ON; I hadn't realised
that.

-- 
Oliver Elphick                                          olly@lfix.co.uk
Isle of Wight                              http://www.lfix.co.uk/oliver
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