Re: What is a tuple?

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От Rich Shepard
Тема Re: What is a tuple?
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Msg-id Pine.LNX.4.44.0206252007050.2847-100000@appl-ecosys.com
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Ответ на Re: What is a tuple?  (Timothy Reaves <treaves@silverfields.com>)
Список pgsql-general
On Tue, 25 Jun 2002, Timothy Reaves wrote:

>     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.

  And, in the same mathematical language of relational databases, what we
commonly call a "table" is a "relation". "Columns" are called "attributes".

  A good database management book will teach you the vocabulary.

Rich

Dr. Richard B. Shepard, President

                       Applied Ecosystem Services, Inc. (TM)
            2404 SW 22nd Street | Troutdale, OR 97060-1247 | U.S.A.
 + 1 503-667-4517 (voice) | + 1 503-667-8863 (fax) | rshepard@appl-ecosys.com
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