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Re: How can I proove associtivity of natural in relational algebra?

From: Mikito Harakiri <mikharakiri_nospaum_at_yahoo.com>
Date: 21 Nov 2005 12:10:45 -0800
Message-ID: <1132603845.384888.67090@g44g2000cwa.googlegroups.com> 





Filter911 wrote:


> Can someone give me a link for a full proof or something?




Given relations A,B, and C, expand each realtion into a (possibly
infinite) relations A', B', and C' with the same set of attributes
(which is the union of the attribute sets for A, B, and C). Then, the
join of A, B and C is the intersection of A', B', and C'. Intersection
is associative.
Received on Mon Nov 21 2005 - 14:10:45 CST












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