Re: Unique Keys
From: Mikito Harakiri <mikharakiri_nospaum_at_yahoo.com>
Date: 27 Nov 2004 10:12:26 -0800
Message-ID: <8a529bb.0411271012.6fc8e42_at_posting.google.com>
Date: 27 Nov 2004 10:12:26 -0800
Message-ID: <8a529bb.0411271012.6fc8e42_at_posting.google.com>
Kenneth Downs <firstinit.lastname_at_lastnameplusfam.net> wrote in message news:<nm4g72-cr6.ln1_at_pluto.downsfam.net>...
> yes, but that is not a unique constraint. Is there anyway at all to imagine
> it as a declarative unique constraint? If we were "thinking outside of the
> box" as it were?
> Mikito Harakiri wrote:
> This question, although perfectly valid, looks tough. Could interval
> domain be mapped into some fancy custom made domain such that interval
> overlapping corresponds to identity?
Of course not! Identity is an equivalence relation, while interval overlapping is not transitive. Received on Sat Nov 27 2004 - 19:12:26 CET