Re: Does entity integrity imply entity identity?
From: Bob Badour <bbadour_at_pei.sympatico.ca>
Date: Sat, 01 Aug 2009 14:22:53 -0300
Message-ID: <4a7479f3$0$23783$9a566e8b_at_news.aliant.net>
Date: Sat, 01 Aug 2009 14:22:53 -0300
Message-ID: <4a7479f3$0$23783$9a566e8b_at_news.aliant.net>
Mr. Scott wrote:
> Since the entity integrity rule ensures that a relational table cannot have
I am unfamiliar with an entity integrity rule. It sounds like some shit
> any duplicate rows, does that imply that each row in a table maps to a
> distinct entity?
http://en.wikipedia.org/wiki/Codd's_12_rules
The guaranteed access rule is sometimes called the logical identity rule. Received on Sat Aug 01 2009 - 19:22:53 CEST