UPDATE vn.province p
		LEFT JOIN vn.zoneGeo zg ON zg.id = p.geoFk
	SET p.geoFk = NULL
	WHERE zg.id IS NULL;

ALTER TABLE vn.province
	ADD CONSTRAINT province_zoneGeo_FK FOREIGN KEY (geoFk)
		REFERENCES vn.zoneGeo(id)
		ON DELETE RESTRICT
		ON UPDATE CASCADE;