Re: Basic question?What 's the key if there 's no FD(Functional Dependencies)?
From: Godspeed <bl719293_at_bigpond.net.au>
Date: Wed, 01 Nov 2006 12:31:05 GMT
Message-ID: <ds02h.57077$rP1.33365_at_news-server.bigpond.net.au>
Date: Wed, 01 Nov 2006 12:31:05 GMT
Message-ID: <ds02h.57077$rP1.33365_at_news-server.bigpond.net.au>
<saturnlee_at_yahoo.com> wrote in message
news:1162158876.794350.29460_at_f16g2000cwb.googlegroups.com...
> I have a basic question.
> Suppose there are 3 attributes: A,B and C.
> And there are no FD(trivial and non trivial )
>
> What 's the key for it? ABC or nothing???
>
It's either {ABC} or {D} where D is an artificial identifier (e.g. a sequence number). Received on Wed Nov 01 2006 - 13:31:05 CET