Comment 1987 added to page ddl-inherit.html of version 7.4

Author: Diego Zuccato <diego(at)otello(dot)alma(dot)unibo(dot)it>
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Replicating PRIMARY KEY in child tables allows only referencing 'em from other tables. It doesn't solve the "duplicated primary key" problem in the parent table. The only way I could find is adding :
CREATE OR REPLACE FUNCTION base_notexists(integer)
RETURNS boolean
STABLE
LANGUAGE 'SQL'
AS 'SELECT NOT EXISTS(SELECT id FROM base WHERE id=$1)';
and the constraint
CHECK (base_notexists(id))

If only it could be possible to reference an already existing index...
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