From: Martín Marqués <martin@bugs.unl.edu.ar>
To: pgsql-sql@postgresql.org
Subject: Re: ENUM like data type
Date: Wed, 29 Jun 2005 10:21:10 -0300
Message-ID: <200506291021.10986.martin@bugs.unl.edu.ar> (raw)
In-Reply-To: <ED4E30DD9C43D5118DFB00508BBBA76EB167AF@neptun.sonorys.at>
References: <ED4E30DD9C43D5118DFB00508BBBA76EB167AF@neptun.sonorys.at>
El Mié 29 Jun 2005 09:40, KÖPFERL Robert escribió:
>
> |
> |I personally think that the ENUM data type is for databases
> |that are not well
> |designed. So, if you see the need for ENUM, that means you
> |need to re-think
> |your data design.
> |
>
> I disagree. In several relations (views of the world) one needs to have a
> hand full of well defined values while
> integers or bools are not appropriate and strings are too free form.
> For example male female or true and false. Whilst the second has a well
> known type, other things like a telephone number type don't have such type.
> So a new one should be created instead of (varchar/ xy between 4 and 8). One
> might argue that new 1:n relations with integrity shall be established but
> this is in my eyes overkill for a constant number of values.
> Also think of schema export without data. These values are part of the
> schema data but not the schema itself which in this sense is wrong
Please, most of this can be done with CHECK(...).
--
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Martín Marqués | Programador, DBA
Centro de Telemática | Administrador
Universidad Nacional
del Litoral
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Subject: Re: ENUM like data type
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