text: DROP TABLE IF EXISTS dummy_entity;
  DROP TABLE IF EXISTS element;
  
  DROP TABLE IF EXISTS root;
  DROP TABLE IF EXISTS intermediate;
  DROP TABLE IF EXISTS leaf;
  
  CREATE TABLE dummy_entity
  (
      id   BIGINT IDENTITY PRIMARY KEY,
      NAME VARCHAR(100)
  );
  CREATE TABLE element
  (
      id               BIGINT IDENTITY PRIMARY KEY,
      content          VARCHAR(100),
      Dummy_Entity_key BIGINT,
      dummy_entity     BIGINT
  );
  
  CREATE TABLE root
  (
      id BIGINT IDENTITY PRIMARY KEY
  );
  CREATE TABLE intermediate
  (
      id       BIGINT IDENTITY PRIMARY KEY,
      root     BIGINT  NOT NULL,
      root_key INTEGER NOT NULL
  );
  CREATE TABLE leaf
  (
      name             VARCHAR(100),
      intermediate     BIGINT  NOT NULL,
      intermediate_key INTEGER NOT NULL
  );
  