From: Yeb Havinga <yebhavinga@gmail.com>
To: Andreas <maps.on@gmx.net>
Cc: pgsql-sql@postgresql.org
Subject: Re: Howto have a unique restraint on UPPER (textfield)
Date: Fri, 05 Feb 2010 21:57:10 +0100
Message-ID: <4B6C8626.6080300@gmail.com> (raw)
In-Reply-To: <4B64EA46.60605@gmx.net>
References: <4B64EA46.60605@gmx.net>
Andreas wrote:
> is there a way to define a unique restraint on UPPER (textfield)?
> psql throws a syntax error because of the upper() function.
The third section of the create index command at
http://www.postgresql.org/docs/8.4/interactive/sql-createindex.html
describes a function based index with as example the function ....
upper! :-)
postgres=# create table aap (a text);
CREATE TABLE
postgres=# create unique index ai on aap (upper(a));
CREATE INDEX
postgres=# insert into aap values ('aap');
INSERT 0 1
postgres=# insert into aap values ('aaP');
ERROR: duplicate key value violates unique constraint "ai"
regards,
Yeb Havinga
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To: pgsql-sql@postgresql.org
Cc: yebhavinga@gmail.com, maps.on@gmx.net
Subject: Re: Howto have a unique restraint on UPPER (textfield)
In-Reply-To: <4B6C8626.6080300@gmail.com>
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