text: CREATE TABLE section4_2.address
  (
    id INT PRIMARY KEY AUTO_INCREMENT,
    address1 VARCHAR(36) NOT NULL,
    address2 VARCHAR(36),
    city VARCHAR(36) NOT NULL,
    state VARCHAR(36),
    zip INT
  );
  
  ALTER TABLE section4_2.person ADD address INT NULL;
  ALTER TABLE section4_2.person
    ADD CONSTRAINT person_address_id_fk
  FOREIGN KEY (address) REFERENCES address (id);