| From: | Jeff Davis <pgsql(at)j-davis(dot)com> |
|---|---|
| To: | Kevin Grittner <Kevin(dot)Grittner(at)wicourts(dot)gov> |
| Cc: | Josh Kupershmidt <schmiddy(at)gmail(dot)com>, Peter Eisentraut <peter_e(at)gmx(dot)net>, Robert Haas <robertmhaas(at)gmail(dot)com>, pgsql-hackers <pgsql-hackers(at)postgresql(dot)org>, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
| Subject: | Re: psql: bogus descriptions displayed by \d+ |
| Date: | 2011-08-05 01:12:06 |
| Message-ID: | 1312506726.22355.11.camel@jdavis-ux.asterdata.local |
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| Lists: | pgsql-hackers |
On Thu, 2011-08-04 at 14:20 -0500, Kevin Grittner wrote:
> Peter Eisentraut <peter_e(at)gmx(dot)net> wrote:
>
> > According to scientific-ish database literature, a table is a
> > relation and vice versa.
>
> I've generally understood the terms more like what is described near
> the top of this page:
>
> http://en.wikipedia.org/wiki/Relation_%28database%29
>
> "In SQL, [...] a relation variable is called a table."
The SQL spec also uses "table" to refer to a *value*. So we certainly
can't turn that around and say "a table in SQL is a relation variable".
It's all a bit loose anyway, because SQL tables aren't really relations
or relation variables (for instance, they can contain duplicates).
Regards,
Jeff Davis
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