Re: What databases have taught me

From: Dmitry A. Kazakov <>
Date: Fri, 23 Jun 2006 19:52:34 +0200
Message-ID: <54qs3ryibb77$.1y0dzau076pum$>

On 23 Jun 2006 10:00:51 -0700, Marshall wrote:

> Bruno Desthuilliers wrote:

>>> Yes, but SQL DBMSs are not R DBMSs.
>> <trolling>
>> And *this*  was exactly the answer I was expecting !-)
>> </trolling>

> Something that is often a source of misunderstanding in crossposted
> threads is that comp.databases.theory is a *theory* newsgroup,
> and we do not limit ourselves, (or sometimes, even concern ourselves)
> with what products are out there today. Our concern is for theory,
> and for what is possible. This is not to deny the existence of
> practical concerns; rather it is to deny the exclusivity of practical
> concerns.

> In *theory* you just use the transitive closure operation. Does
> this help you solve your practical problem today? Sorry, no.
> (However, you may wish to check if the database product
> you use does support some kind of transitive closure operation,
> such as Oracle's CONNECT BY.)

If we are done with transitive closure, well, so far theoretically, then let's take a dual graph.

Dmitry A. Kazakov
Received on Fri Jun 23 2006 - 19:52:34 CEST

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