ALTER TABLE pod_group ADD COLUMN personnal_group BOOLEAN; CREATE TABLE pod_group_node ( group_id INTEGER NOT NULL, node_id INTEGER NOT NULL, rights INTEGER, CONSTRAINT pod_group_node_pkey PRIMARY KEY (group_id, node_id), CONSTRAINT pod_group_node_group_id_fkey FOREIGN KEY (group_id) REFERENCES pod_group (group_id) MATCH SIMPLE ON UPDATE CASCADE ON DELETE CASCADE );