Re: Constraints and Functional Dependencies

Marshall wrote:
On Feb 24, 11:28 am, paul c <toledobythe...@xxxxxxxx> wrote:

It looked to me as if the OP did define it. I've seen the same
definition expressed in equivalent algebra here many moons ago.


Specifically I defined a particular kind of FD which is equivalent
to a candidate key. An FD in turn being a particular kind
of constraint.

Hmmm. Can we express keyness otherwise? I can't think how.

SOL (I'm suspect), but that's another topic, as far as most people are concerned. I don't say it's better, just that I haven't seen anybody yet say why it's worse.

p
.