Re: Self-referential records - Mailing list pgsql-general

From Leif Biberg Kristensen
Subject Re: Self-referential records
Date
Msg-id 201001241503.39285.leif@solumslekt.org
Whole thread Raw
In response to Self-referential records  (Ovid <curtis_ovid_poe@yahoo.com>)
List pgsql-general
On Sunday 24. January 2010 14.43.10 Ovid wrote:
> Assuming I have the following table:
>
>     CREATE TABLE refers (
>       id        SERIAL  PRIMARY KEY,
>       name      VARCHAR(255) NOT NULL,
>       parent_id INTEGER NOT NULL,
>       FOREIGN KEY (parent_id) REFERENCES refers(id)
>   );
> I need to insert two records so that "select * from refers" looks like this:
>
>     =# select * from refers;
>      id | name | parent_id
>     ----+------+-----------
>       1 | xxxx |         1
>       2 | yyy  |         2
>
> The first record can't be inserted because I don't yet know the parent_id.

I've got a similar structure. I just declared the root node with both id and
parent_id=0.

regards,
--
Leif Biberg Kristensen
http://solumslekt.org/

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