Re: does a table always need a PK?
From: Jan Hidders <jan.hidders_at_pandora.be>
Date: Sun, 24 Aug 2003 22:43:49 GMT
Message-ID: <Fcb2b.85650$F92.9338_at_afrodite.telenet-ops.be>
Date: Sun, 24 Aug 2003 22:43:49 GMT
Message-ID: <Fcb2b.85650$F92.9338_at_afrodite.telenet-ops.be>
Heikki Tuuri wrote:
>
> If we have a quantum mechanical system where electrons are
> indistinguishable, would it not be natural to create a table of electrons
> without a primary key?
... and forget about the Pauli Exclusion Principle? :-)
But apart from that, if all electrons are indistinguishable then in fact there is actually just one electron, isn't there? So your question should actually have been:
If we have a quantum mechanical system with always one electron, would it not be natural to create a table of electrons without a primary key?
The answer would be of course "no" because this table has a unique candidate key: the empty set.
- Jan Hidders