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.
  --
  
  CREATE
  MEMORY TABLE POST(POST_ID INTEGER NOT NULL PRIMARY KEY,CONTENT VARCHAR(255) NOT NULL,AUTHOR_ID INTEGER NOT NULL);
  CREATE
  MEMORY TABLE AUTHOR(AUTHOR_ID INTEGER NOT NULL PRIMARY KEY,NAME VARCHAR(255));
  INSERT INTO POST
  VALUES (1, 'content 1', 1);
  INSERT INTO POST
  VALUES (2, 'content 2', 1);
  INSERT INTO POST
  VALUES (3, 'content 3', 1);
  INSERT INTO AUTHOR
  VALUES (1, 'James Brown');
  ALTER TABLE POST
      ADD CONSTRAINT AUTHOR_CONSTRAINT FOREIGN KEY (AUTHOR_ID) REFERENCES AUTHOR (AUTHOR_ID);
  