Re: Sixth normal form
Date: Wed, 01 Aug 2007 20:19:41 GMT
Brian Selzer wrote:
> It's somewhat unrelated, ...
I was with you up 'til the first comma in the last paragraph. It sure doesn't have to do with redundancy. First there were rigid keys, then contingent keys, now we have immune keys. Newcomers please note - don't believe this mumbo-jumbo, it is all undefined mysticism, as is the term "key update".
Also, I would like to know if anybody has ever invented a relational algebra or calculus that supports "update". AFAIK, update is either a system colloquial, environmental or a language, say SQL, term. Yeah, I know people say "update" a tuple et cetera and I think that's okay if it is agreed and understood just what exactly the system or dbms they have in mind is going to do about the "update". In the recent threads, I don't and I'm pretty sure we don't either.
p Received on Wed Aug 01 2007 - 22:19:41 CEST