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Re: BUG #2390: check constraint

From: Stephan Szabo <sszabo(at)megazone(dot)bigpanda(dot)com>
To: Andreas Kretschmer <andreas(dot)kretschmer(at)schollglas(dot)com>
Cc: pgsql-bugs(at)postgresql(dot)org
Subject: Re: BUG #2390: check constraint
Date: 2006-04-13 16:01:57
Message-ID: (view raw, whole thread or download thread mbox)
Lists: pgsql-bugs
On Wed, 12 Apr 2006, Andreas Kretschmer wrote:

> The following bug has been logged online:
> Bug reference:      2390
> Logged by:          Andreas Kretschmer
> Email address:      andreas(dot)kretschmer(at)schollglas(dot)com
> PostgreSQL version: 8.1.3
> Operating system:   Debian Linux
> Description:        check constraint
> Details:
> i want to add a check constraint like:
> create table foo (i char(7) CHECK (i ~ '^[0-9]{6,7}$'));
> i doesn't work, but if works, if i change the type for i to varchar(7).

Well, the regex doesn't entirely make sense for char(n) data.  It's not
possible to have 6 characters between beginning and end because it's a
fixed length 7 character string. If you try to insert '000000' into i,
you're actually inserting '000000 ' which is invalid by the constraint.

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