text: CREATE TABLE employee (
      id INT AUTO_INCREMENT PRIMARY KEY,
      first_name VARCHAR(30) NOT NULL,
      last_name VARCHAR(30) NOT NULL,
      role_id INT,
      manager_id INT,
      CONSTRAINT FK_role_id FOREIGN KEY (role_id) 
      REFERENCES role(id),
      CONSTRAINT FK_manager_id FOREIGN KEY (manager_id) 
      REFERENCES employee(id)
  );
  
  CREATE TABLE employee (
      id INT AUTO_INCREMENT PRIMARY KEY,
      first_name VARCHAR(30) NOT NULL,
      last_name VARCHAR(30) NOT NULL,
      role_id INT,
      manager_id INT,
      FOREIGN KEY (role_id) REFERENCES role(id),
      FOREIGN KEY (manager_id) REFERENCES employee(id)
  );