text: DROP TABLE drivers_license IF EXISTS;
  DROP TABLE person IF EXISTS;
  
  CREATE TABLE person (
  	id INTEGER NOT NULL IDENTITY,
  	name VARCHAR(50) NOT NULL,
  	drivers_license_id INTEGER NOT NULL
  );
  CREATE UNIQUE INDEX person_name ON person(name);
  CREATE UNIQUE INDEX person_drivers_license_id ON person(drivers_license_id);
  
  CREATE TABLE drivers_license (
  	id INTEGER NOT NULL IDENTITY,
  	license_number INTEGER NOT NULL
  );
  CREATE UNIQUE INDEX drivers_license_license_number ON drivers_license(license_number);
  