| From: | Bruno Wolff III <bruno(at)wolff(dot)to> |
|---|---|
| To: | Mike Mascari <mascarm(at)mascari(dot)com> |
| Cc: | MT <m_tessier(at)sympatico(dot)ca>, GENERAL <pgsql-general(at)postgresql(dot)org> |
| Subject: | Re: How many fields in a table are too many |
| Date: | 2003-06-26 11:31:42 |
| Message-ID: | 20030626113142.GA6568@wolff.to |
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| Lists: | pgsql-general |
On Thu, Jun 26, 2003 at 01:02:06 -0400,
Mike Mascari <mascarm(at)mascari(dot)com> wrote:
> > Hi,
> >
> > Just a quick question, not unrelated to my
> > previous question, which I don't think will
> > get answered. I have a table with 13 fields.
> > Is that too many fields for one table.
>
> Mathematically, a binary relation represents the relevant cross
> product of two domains, x and f(x):
A binary relation is a subset of the cross product of two sets.
This is more general than using x and f(x) since this implies some
restrictions on the subset (namely that there is only one tuple
with a specific member of x in the x part of the tuple).
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