Re: deductive databases
From: VC <boston103_at_hotmail.com>
Date: Tue, 17 May 2005 06:25:31 -0400
Message-ID: <p56dnTmpwdoJWxTfRVn-sQ_at_comcast.com>
Date: Tue, 17 May 2005 06:25:31 -0400
Message-ID: <p56dnTmpwdoJWxTfRVn-sQ_at_comcast.com>
"Simon Taylor" <stayl_at_cs.mu.oz.au> wrote in message
news:428982b5$1_at_news.unimelb.edu.au...
> Nesting is not significant; it's allowing data structures to express
> choice that increases the expressive power.
Could you please elaborate on this one ?
>Without that, database
> developers have to resort to kludges like NULL or excessively complex
> relational decompositions to deal with missing or optional data.
And on this one too ? With an example if possible ...
>
> Simon Taylor.
Thanks. Received on Tue May 17 2005 - 12:25:31 CEST