Re: Complete axiomatization of relational algebra

From: Vadim Tropashko <Vadim_member_at_newsranger.com>
Date: Mon, 19 Feb 2001 22:37:06 GMT
Message-ID: <mehk6.20$aw5.200@www.newsranger.com>

In article <Ixpj6.35548$2X4.112326_at_petpeeve.ziplink.net>, David Cressey says...
>
>An interesting exercise, occasionally, is to take a column that permits
>NULLS and discover a pair of decomposed tables
>and an outer join that would have resulted in the single table with optional
>column we were given.
>
>I did this exercise a few times. It resulting in my discovery of more and
>more about less and less, until I finally knew a lot about nothing at all!
>;) ;) ;)

The conclusion sounds very intriguing. Could you share some inspirational example, please? Received on Mon Feb 19 2001 - 16:37:06 CST