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Re: Is a primary key made of a couple columns so much better than a unique() constraint ? - Mailing list pgsql-general

From Martijn van Oosterhout
Subject Re: Is a primary key made of a couple columns so much better than a unique() constraint ?
Date
Msg-id 20051010150206.GB29638@svana.org
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In response to Is a primary key made of a couple columns so much better than a unique() constraint ?  (David Pradier <david.pradier@clarisys.fr>)
Responses Re: Is a primary key made of a couple columns so much better than a unique() constraint ?  (David Pradier <david.pradier@clarisys.fr>)
Re: Is a primary key made of a couple columns so much better than a unique() constraint ?  (Tom Lane <tgl@sss.pgh.pa.us>)
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On Mon, Oct 10, 2005 at 04:44:54PM +0200, David Pradier wrote:
> Hi everybody,
>
> i'd like to know if it is better to use a primary key made of a couple
> columns, than to use a constraint UNIQUE() on this couple columns,
> regarding the sake of postgresql.

In PostgreSQL, both primary keys and UNIQUE constraints are implemented
via UNIQUE indexes, ergo there is no difference...

Have a nice day,
--
Martijn van Oosterhout   <kleptog@svana.org>   http://svana.org/kleptog/
> Patent. n. Genius is 5% inspiration and 95% perspiration. A patent is a
> tool for doing 5% of the work and then sitting around waiting for someone
> else to do the other 95% so you can sue them.
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