From: Martín Marqués <martin@bugs.unl.edu.ar>
To: PFC <lists@boutiquenumerique.com>
Cc: Mike Rylander <mrylander@gmail.com>
Cc: pgsql-sql@postgresql.org
Subject: Re: ENUM like data type
Date: Tue, 28 Jun 2005 15:22:25 -0300
Message-ID: <200506281522.25124.martin@bugs.unl.edu.ar> (raw)
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El Mar 28 Jun 2005 13:58, PFC escribió:
>
> >> Here is where I get uncertain as to if this is possible. My idea is to
> >> create a pseudo type that triggers the creation of it's lookup tables
> >> the same way the SERIAL type triggers creation of a sequence and returns
> >> an int with the right default value.
>
> Personnally I use one table which has columns (domain, name) and which
> stores all enum values for all different enums.
> I have then CHECK( is_in_domain( column, 'domain_name' )) which is a
> simple function which checks existence of the value in this domain (SELECT
> 1 FROM domains WHERE domain=$2 AND name=$1 LIMIT 1) for instance.
> You can also use integers.
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.
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Martín Marqués | Programador, DBA
Centro de Telemática | Administrador
Universidad Nacional
del Litoral
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To: pgsql-sql@postgresql.org
Cc: martin@bugs.unl.edu.ar, lists@boutiquenumerique.com, mrylander@gmail.com
Subject: Re: ENUM like data type
In-Reply-To: <200506281522.25124.martin@bugs.unl.edu.ar>
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