Re: One-To-One Relationships
From: paul c <toledobythesea_at_ooyah.ac>
Date: Sat, 01 Dec 2007 19:38:36 GMT
Message-ID: <0Li4j.81877$cD.64455_at_pd7urf2no>
Date: Sat, 01 Dec 2007 19:38:36 GMT
Message-ID: <0Li4j.81877$cD.64455_at_pd7urf2no>
Cimode wrote:
> ... I do believe that the keys was simply Codd's way to
> express *identifiablity* in a way that his IBM audience could be
> receptive to the rest of the model...
That is very plausible. At the time, most, if not all IBM disk drives implemented keys in hardware. Other manufacturers supplied similar. Thinking of keys as physical was widespread, albeit in an IT world that was much smaller than now. Received on Sat Dec 01 2007 - 20:38:36 CET