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
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