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Re: constraints in algebra instead of calculus

From: Jon Heggland <jon.heggland_at_idi.ntnu.no>
Date: Tue, 19 Jun 2007 11:02:50 +0200
Message-ID: <f5863p$d59$1@orkan.itea.ntnu.no> 





Jon Heggland wrote:


> I prefer the rename-join; it can be used for not only superkeys, but FDs

> in general. 




Umm, of course all of them can, if you use the projection over the
attributes involved in the FD as R.

-- 
Jon


Received on Tue Jun 19 2007 - 04:02:50 CDT












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