Re: Counting links between to records on the same table (Clustering?)
Date: Mon, 27 Jun 2005 17:23:53 +0100
Message-ID: <so70c1dceqt0uce6v9kmtpno1sficvgbpv_at_4ax.com>
On Mon, 27 Jun 2005 15:34:58 GMT, paul c <toledobythesea_at_oohay.ac> wrote:
>Dale Walker wrote:
>> I'm trying to develop a little method that groups DJs together into
>> similar tastes in music so that people can work out if they might like
>> a certain night out.
. . .
>i suppose the canonical approach is to say that the relation is between
>events and dj's, not among dj's, so a composite key could be event id
>and dj id where the implicit total is always 1! or 1 factorial if you
>prefer. undoubtedly somebody will suggest constraints on the grounds
>that this key is not mapped well by conventional products but this is a
>theory group so that doesn't matter, haha.
>so my cut at it is that this is a query question, not a design question
>and i'll leave the sql to people who like that stuff.
I hope it is just a simple query problem but the whole impetus behind this query is to start getting into using AI techniques in databases to collate data. Thought it was a good idea to start small and work my way up.
I come from a coding background and find that it's a often tough job to reprogram my brain to deal with problems in terms of queries.
>i've given you perhaps no answer at all. it's just that it makes me
>wonder - i don't know about others but i often find myself wanting to
>impose some kind of geometry on such designs even though the rm doesn't
>intend that. personally, i'd like to see a product that lets me say two
>unpopulated 'views' or relations for that matter, are somehow equivalent
>without a bunch of obscure constraint coding. i don't know if such a
>concept has a name, perhaps co-dependent relations where the db asserts
>that you can't have one without the other or if it's all part of the
>user or psychological aspect of the rm or if it's not a concept at all
>and just logically ridiculous.
It's probably just a query question and you keep leaving it to the sql people to sort out ;)
--- Dale Walker London Techno Events dale_at_sorted,org http://london.sorted.orgReceived on Mon Jun 27 2005 - 18:23:53 CEST