REFERENCES and INHERITS restrictions?

Hi all


I’m confronted with the following problem:

I have a base table with several child tables which also use the parent’s primary key as their own primary key:


CREATE TABLE tbl_parent
( p_id serial NOT NULL, p_time timestamp(6) with time zone NOT NULL DEFAULT '1970-01-01 01:00:00+01'::timestamp with
timezone, CONSTRAINT tbl_parent_pkey PRIMARY KEY (p_id)
 
);

CREATE TABLE tbl_child1
( c1_something character varying(64) NOT NULL, CONSTRAINT tbl_child1_pkey PRIMARY KEY (p_id),
) INHERITS (tbl_parent);

CREATE TABLE tbl_child2
( c2_somethingelse integer NOT NULL, CONSTRAINT tbl_child2_pkey PRIMARY KEY (p_id),
) INHERITS (tbl_parent);


This works fine so far. Now I got another table that references to the primary key of the parent (I need an n to n
relationbetween another table and an aggregation of all my child tables, which means an n to n relation between the
othertable and the parent table):
 


CREATE TABLE tbl_reference
( ref_id serial NOT NULL, ref_parent integer NOT NULL, ref_othertable integer NOT NULL, CONSTRAINT tbl_reference_pkey
PRIMARYKEY (ref_id), CONSTRAINT tbl_reference_ref_parent_fkey FOREIGN KEY (ref_parent)     REFERENCES tbl_parent (p_id)
MATCHSIMPLE     ON UPDATE CASCADE ON DELETE CASCADE, CONSTRAINT tbl_reference_ref_othertable_fkey FOREIGN KEY
(ref_othertable)    REFERENCES tbl_othertable (ot_id) MATCH SIMPLE     ON UPDATE CASCADE ON DELETE SET NULL
 
)


When I try to insert into tbl_reference now, I get an sql error:

INSERT INTO tbl_child1(p_time,c1_something) VALUES ('2008-01-01', 'foo');
INSERT 0 1

SELECT * FROM tbl_parent;p_id |        p_time
------+------------------------   1 | 2008-01-01 00:00:00+01
(1 row)

INSERT INTO tbl_reference(ref_parent,ref_othertable) VALUES ('1','1');
ERROR:  insert or update on table "tbl_reference" violates foreign key constrain
t "tbl_reference_ref_parent_fkey"
DETAIL:  Key (ref_parent)=(1) is not present in table "tbl_parent".


Why is this not possible? It seems that this is about inheritance. When I reference directly to tbl_child1, everything
worksjust fine.
 

Any idea?


Greets Stefan

-- 
Ist Ihr Browser Vista-kompatibel? Jetzt die neuesten 
Browser-Versionen downloaden: http://www.gmx.net/de/go/browser