text: INSERT INTO customer (id, name, birthdate) VALUES (1, 'John Doe', '1960-10-30');
  INSERT INTO customer (id, name, birthdate) VALUES (2, 'Pepito Pérez', '1954-07-15');
  INSERT INTO customer (id, name, birthdate) VALUES (3, 'Cosme Fulanito', '1956-05-12');