Re: A pk is *both* a physical and a logical object.
From: paul c <toledobythesea_at_oohay.ac>
Date: Wed, 18 Jul 2007 15:54:37 GMT
Message-ID: <1Jqni.129238$NV3.92140_at_pd7urf2no>
>
>
> You're proving my point: it can't be determined whether it is a different
> individual or the same individual because the key value is not rigid. ...
Date: Wed, 18 Jul 2007 15:54:37 GMT
Message-ID: <1Jqni.129238$NV3.92140_at_pd7urf2no>
Brian Selzer wrote:
> "David Cressey" <cressey73_at_verizon.net> wrote in message
> news:Cmhni.6545$Gx5.2883_at_trndny02...
...
>>The table deosn't tell you whether a widget was moved, or whether a >>widget >>was removed, and another one inserted somewhere else. >>
>
>
> You're proving my point: it can't be determined whether it is a different
> individual or the same individual because the key value is not rigid. ...
Regarding rigidity, I would say that if we ever admit a value to be not rigid, further investigation becomes pointless and we are lost.
p Received on Wed Jul 18 2007 - 17:54:37 CEST