Re: pg primary key bug?

On Thu, Feb 17, 2005 at 04:12:38PM +0100, pginfo wrote:

> 01=# select * from a_constants_str where constname='DOCPLAID' ;
> constname | fid | constvalue
> -----------+-----+------------
> DOCPLAID | 0 | SOF_19738
> DOCPLAID | 0 | SOF_19738
> (2 rows)

Do you have any inherited tables? What's the result of the following
query?

SELECT tableoid::regclass, *
FROM a_constants_str
WHERE constname = 'DOCPLAID';

Inherited tables are documented to have deficiencies regarding
constraints. Observe:

CREATE TABLE parent (
constname varchar(30) NOT NULL,
fid integer NOT NULL,
constvalue varchar(30),
PRIMARY KEY (constname, fid)
);

CREATE TABLE child () INHERITS (parent);

INSERT INTO parent VALUES ('DOCPLAID', 0, 'SOF_19738');

INSERT INTO parent VALUES ('DOCPLAID', 0, 'SOF_19738');
ERROR: duplicate key violates unique constraint "parent_pkey"

INSERT INTO child VALUES ('DOCPLAID', 0, 'SOF_19738');

SELECT tableoid::regclass, * FROM parent;
tableoid | constname | fid | constvalue
----------+-----------+-----+------------
parent | DOCPLAID | 0 | SOF_19738
child | DOCPLAID | 0 | SOF_19738
(2 rows)

--
Michael Fuhr
http://www.fuhr.org/~mfuhr/