Re: Primary key inheritance problem

From: Oliver Elphick <olly(at)lfix(dot)co(dot)uk>
To: Bruno Baguette <pgsql-ml(at)baguette(dot)net>
Cc: pgsql-general(at)postgresql(dot)org
Subject: Re: Primary key inheritance problem
Date: 2004-08-29 16:34:08
Message-ID: 1093797247.29613.347.camel@linda
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On Fri, 2004-08-27 at 11:58, Bruno Baguette wrote:
> Hello,
>
> I've a strange problem with inheritance on PostgreSQL 7.4.1. It seems
> like tables don't inherits the primary key of the 'mother' table.
...
> The error I get is :
> ERROR: there is no unique constraint matching given keys for referenced
> table "child_foo"

Primary and foreign key constraints are not inherited. This is a defect
in the current system.

> What can I do to solve that problem ?

Create an index table to provide a unique key for the whole hierarchy.
Each member of the hierarchy has a foreign key reference to it na has
its own primary key on the referencing field. Use triggers to update
the index table.

--
Oliver Elphick olly(at)lfix(dot)co(dot)uk
Isle of Wight http://www.lfix.co.uk/oliver
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