Re: Primary key inheritance problem

On Fri, 27 Aug 2004, 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.
> Here's a little sample to show my problem :
>
> CREATE TABLE foo_a
> (
>         pk_idmyfoo INT2 PRIMARY KEY NOT NULL,
>         myfoo_name VARCHAR(10)
> );
>
> CREATE TABLE child_foo
> (
>         child_foo_nickname VARCHAR(20)
> ) INHERITS (foo_a);
>
> CREATE TABLE childfoo_bookmarks
> (
>         fk_idchildfoo INT2 NOT NULL REFERENCES child_foo (pk_idmyfoo),
>         url VARCHAR(250)
> );
>
> The error I get is :
> ERROR:  there is no unique constraint matching given keys for referenced
> table "child_foo"
>
> What can I do to solve that problem ?

Well, to shut up the message you can add a constraint to child_foo's
version of pk_idmyfoo.  However, as a note, that'll not guarantee
uniqueness between foo_a's pk_idmyfoo values and child_foo's ones.