| From: | Timothy Reaves <treaves(at)silverfields(dot)com> |
|---|---|
| To: | Elaine Lindelef <eel(at)cognitivity(dot)com> |
| Cc: | pgsql-general(at)postgresql(dot)org |
| Subject: | Re: What is a tuple? |
| Date: | 2002-06-26 02:48:11 |
| Message-ID: | 20020625224811.6854a2bb.treaves@silverfields.com |
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| Lists: | pgsql-general |
On Tue, 25 Jun 2002 14:40:03 -0700
Elaine Lindelef <eel(at)cognitivity(dot)com> wrote:
> My apologies for the stupid question, but before I started using
> postgres I never came across the word "tuple" quite in this context
> before. I know a "tuple" as "a data object containing two or more
> components" ... but I'm not sure of its precise meaning in the
> postgres universe. Is a tuple a row, a field value, a field value
> paired with its datatype, what? If someone asks me the size of my
> largest tuple, how do I calculate it? It seems to be related deeply
> to the structure of postgres somehow.
>
A 'tuple' is not a database - nor PostgreSQL - term. It is a
mathimatical term meaing a set. Withen the context of databases, a tuple
is always a row. 'Tuples' refers to the tuple set, or row set.
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