text: DROP DATABASE IF EXISTS cms_DB;
  CREATE DATABASE cms_DB;
  
  USE cms_DB;
  
  CREATE TABLE employee(
    id INT NOT NULL AUTO_INCREMENT,
    first_name VARCHAR(30) NOT NULL,
    last_name VARCHAR(30) NOT NULL,
    role_id INT default 0 NOT NULL,
    manager_id INT default 0,
    PRIMARY KEY (id)
  );
  
  CREATE TABLE role(
    id INT NOT NULL AUTO_INCREMENT,
    title VARCHAR(30) NOT NULL,
    salary DECIMAL NOT NULL,
    department_id INT default 0 NOT NULL,
    PRIMARY KEY (id)
  );
  
  CREATE TABLE department(
    id INT NOT NULL AUTO_INCREMENT,
    name VARCHAR(30) NOT NULL,
    PRIMARY KEY (id)
  );