text: --
  --    Copyright 2009-2021 the original author or authors.
  --
  --    Licensed under the Apache License, Version 2.0 (the "License");
  --    you may not use this file except in compliance with the License.
  --    You may obtain a copy of the License at
  --
  --       http://www.apache.org/licenses/LICENSE-2.0
  --
  --    Unless required by applicable law or agreed to in writing, software
  --    distributed under the License is distributed on an "AS IS" BASIS,
  --    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  --    See the License for the specific language governing permissions and
  --    limitations under the License.
  --
  
  drop table vehicle if exists;
  drop table owner if exists;
  
  create table vehicle (
    id int,
    maker varchar(20),
    vehicle_type int,
    door_count int,
    carrying_capacity float
  );
  
  insert into vehicle (id, maker, vehicle_type, door_count, carrying_capacity) values
  (1, 'Maker1', 1, 5, null),
  (2, 'Maker2', 2, null, 1.5);
  
  create table owner (
      id int,
      name varchar(20),
      vehicle_type varchar(20),
      vehicle_id int
  );
  
  insert into owner (id, name, vehicle_type, vehicle_id) values
  (1, 'Owner1', 'truck', 2),
  (2, 'Owner2', 'car', 1);
  