From: Joshua Tolley <eggyknap@gmail.com>
To: Andreas <maps.on@gmx.net>
Cc: pgsql-sql@postgresql.org
Subject: Re: Howto have a unique restraint on UPPER (textfield)
Date: Sat, 30 Jan 2010 19:56:53 -0700
Message-ID: <4b64f184.9613f30a.5d13.01b2@mx.google.com> (raw)
In-Reply-To: <4B64EA46.60605@gmx.net>
References: <4B64EA46.60605@gmx.net>
On Sun, Jan 31, 2010 at 03:26:14AM +0100, Andreas wrote:
> Hi,
>
> is there a way to define a unique restraint on UPPER (textfield)?
>
> E.g. mytable (
> name_id serial PRIMARY KEY,
> name varchar(255),
> UNIQUE ( upper (name) )
> )
>
> psql throws a syntax error because of the upper() function.
>
> I need to prohibit that 2 of strings like cow, Cow, CoW appears in
> the name-column.
Like this:
5432 josh@josh# create table c (d text);
CREATE TABLE
5432 josh@josh*# create unique index c_ix on c (upper(d));
CREATE INDEX
5432 josh@josh*# insert into c (d) values ('text');
INSERT 0 1
5432 josh@josh*# insert into c (d) values ('tExt');
ERROR: duplicate key value violates unique constraint "c_ix"
--
Joshua Tolley / eggyknap
End Point Corporation
http://www.endpoint.comAttachments:
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To: pgsql-sql@postgresql.org
Cc: eggyknap@gmail.com, maps.on@gmx.net
Subject: Re: Howto have a unique restraint on UPPER (textfield)
In-Reply-To: <4b64f184.9613f30a.5d13.01b2@mx.google.com>
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