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$1_at_orkan.itea.ntnu.no>
Date: Tue, 19 Jun 2007 11:02:50 +0200
Message-ID: <f5863p$d59$1_at_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.
-- JonReceived on Tue Jun 19 2007 - 11:02:50 CEST