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Re: Inherited FK Indexing

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On Sep 14, 2007, at 10:35 AM, Ketema Harris wrote:

I have the following table set up:

CREATE TABLE states
(
state_id integer NOT NULL DEFAULT nextval ('state_province_id_seq'::regclass),
  state character(2),
  full_name character varying,
  timezone character varying,
  CONSTRAINT "PK_state_id" PRIMARY KEY (state_id)
)

CREATE TABLE canadian_provinces
(
-- Inherited: state_id integer NOT NULL DEFAULT nextval ('state_province_id_seq'::regclass),
-- Inherited:   state character(2),
-- Inherited:   full_name character varying,
-- Inherited:   timezone character varying,
  CONSTRAINT "PK_province_id" PRIMARY KEY (state_id)
)

as expected I can do select * from states and get everything out of the child table as well. What I can't do is create a FK to the states table and have it look in the child table as well. Is this on purpose? Is it possible to have FK that spans into child tables?

I'm assuming you just left out an INHERITS clause or ALTER TABLE statement to add the inheritance? Anyways, the answer to your question is no, you'll need to create any dependencies to child tables separately.

Erik Jones

Software Developer | Emma®
erik@xxxxxxxxxx
800.595.4401 or 615.292.5888
615.292.0777 (fax)

Emma helps organizations everywhere communicate & market in style.
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---------------------------(end of broadcast)---------------------------
TIP 9: In versions below 8.0, the planner will ignore your desire to
      choose an index scan if your joining column's datatypes do not
      match


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