text: --
  --    Copyright 2009-2014 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 if exists users;
  create table users (
    id int,
    name varchar(20)
  );
  
  drop table if exists udata;
  create table udata (
    user_id int,
    num int
  );
  
  insert into users (id, name) values(1, 'User1');
  insert into udata (user_id, num) values(1, 100);
  insert into udata (user_id, num) values(1, 300);
  