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;