Re: Does entity integrity imply entity identity?
Date: Sat, 1 Aug 2009 18:30:32 +0100
"Mr. Scott" <do_not_reply_at_noone.com> wrote in message
> Since the entity integrity rule ensures that a relational table cannot
> have any duplicate rows, does that imply that each row in a table maps to
> a distinct entity?
It's more reasonable to say that a tuple can be understood to represent some
fact which is normally assumed to be true. Entity = Thing. I don't see any
special reason why a tuple MUST map to a "thing" (whatever that means) but
if you find that interpretation useful then use it.
The concept of "Entity Integrity" is not much more than a restatement of
The concept of "Entity Integrity" is not much more than a restatement ofwhat a relation is anyway.
-- David PortasReceived on Sat Aug 01 2009 - 19:30:32 CEST