Re: inherit with foreign key reference

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От elein@varlena.com (elein)
Тема Re: inherit with foreign key reference
Дата
Msg-id 20050506212123.GZ7396@varlena.com
обсуждение исходный текст
Ответ на inherit with foreign key reference  (Aaron Steele <asteele@berkeley.edu>)
Список pgsql-general
On Fri, May 06, 2005 at 01:51:45PM -0700, Aaron Steele wrote:
> dear readers,
>
> i've created a simple Fooey table that inherits from Foo:
> !----------------------------------------------------------!
> CREATE TABLE Foo(
>     fooid        serial UNIQUE,
>     footype        text);
> CREATE TABLE Fooey(
>     data        text);
> INHERITS(Foo);
> !----------------------------------------------------------!
>
> next i try to create a Bar table that references Fooey's fooid (inherited
> from Foo) as a foreign key:
> !----------------------------------------------------------!
> CREATE TABLE Bar(
>     fooeyid     int REFERENCES Fooey(fooid));
> !----------------------------------------------------------!
>
> unfortunately i get the following error:
> !----------------------------------------------------------!
> ERROR:  there is no unique constraint matching given keys for referenced
> table "pagesrc"
> !----------------------------------------------------------!
>
> thoughts?
>
> thanks,
> aaron

You need to alter table Fooey to add fooid as UNIQUE NOT NULL
or PRIMARY KEY.  Then is will work fine.

See also: http://www.varlena.com/GeneralBits/106.php

--elein

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