Re: Looking for comments

From: Peter Eisentraut <peter_e(at)gmx(dot)net>
To: Thomas SMETS <tsmets(at)altern(dot)org>
Cc: Oliver Elphick <olly(at)lfix(dot)co(dot)uk>, psql sql <pgsql-sql(at)postgresql(dot)org>
Subject: Re: Looking for comments
Date: 2001-01-02 17:04:33
Message-ID: Pine.LNX.4.30.0101021802260.758-100000@peter.localdomain
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Thomas SMETS writes:

> <snip>
> ISBN's have a checkdigit; it would be sensible to provide a
> function to be used in a CHECK constraint to ensure that the
> ISBN is valid.
> </snip>
>
> OK I'll start searching for it but haven't implemented yet

In the PostgreSQL distribution there's a directory contrib/isbn_issn that
defines a couple of data types that might help you.

--
Peter Eisentraut peter_e(at)gmx(dot)net http://yi.org/peter-e/

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