Re: Multiple-Attribute Keys and 1NF
From: JOG <jog_at_cs.nott.ac.uk>
Date: Fri, 31 Aug 2007 11:53:50 -0000
Message-ID: <1188561230.592886.194350_at_r34g2000hsd.googlegroups.com>
Date: Fri, 31 Aug 2007 11:53:50 -0000
Message-ID: <1188561230.592886.194350_at_r34g2000hsd.googlegroups.com>
On Aug 31, 12:47 pm, JOG <j..._at_cs.nott.ac.uk> wrote:
> Or generally:
> i.e. WHERE exists(Role, x) => { p ε R | ∃x (Role, x)
> ε p }
so much for trying to use html char codes. Lets try again:
Or generally:
WHERE exists(Role, 1) => { p E R | EXISTS!x (Role, x) E p }
WHERE exists(Role, n) => { p E R | EXISTS=n x (Role, x) E p }
Received on Fri Aug 31 2007 - 13:53:50 CEST