From: Jorge Godoy <jgodoy@gmail.com>
To: Daniel CAUNE <d.caune@free.fr>
Cc: pgsql-sql@postgresql.org
Subject: Re: Constraint UNIQUE on a column not case sensitive
Date: Sat, 01 Jul 2006 11:04:13 -0300
Message-ID: <87irmha0bm.fsf@gmail.com> (raw)
In-Reply-To: <0J1Q008ME8ZX7M90@VL-MO-MR003.ip.videotron.ca>
References: <0J1Q008ME8ZX7M90@VL-MO-MR003.ip.videotron.ca>
Daniel CAUNE <d.caune@free.fr> writes:
> Hi,
>
> I would like to find an efficient solution for adding/implementing a
> constraint UNIQUE on a VARCHAR column not case sensitive:
>
> ALTER TABLE MyTable
> ADD CONSTRAINT UNQ_MyTable_MyColumn
> UNIQUE (lower(MyColumn)); -- invalid syntax
>
> The idea is to have an index on that column, in a not case sensitive form,
> i.e. lower(MyColumn).
What's the problem with CREATE INDEX then?
CREATE INDEX idx_something ON mytable (lower(mycolumn));
--
Jorge Godoy <jgodoy@gmail.com>
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To: pgsql-sql@postgresql.org
Cc: jgodoy@gmail.com, d.caune@free.fr
Subject: Re: Constraint UNIQUE on a column not case sensitive
In-Reply-To: <87irmha0bm.fsf@gmail.com>
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