text: -- Drop if database exists, and then Create
  DROP DATABASE IF EXISTS employee_trackerDB;
  CREATE DATABASE employee_trackerDB;
  -- Use the new Database
  USE employee_trackerDB;
  -- Department Table
  CREATE TABLE department (
    id INT NOT NULL AUTO_INCREMENT,
    name VARCHAR(30) NULL,
    PRIMARY KEY (id)
  );
  -- Role table with foreign key to Department table
  CREATE TABLE role (
    id INT NOT NULL AUTO_INCREMENT,
    title VARCHAR(30) NULL,
    salary DECIMAL NULL,
    department_id INT NOT NULL,
    PRIMARY KEY (id),
    CONSTRAINT fk_department FOREIGN KEY (department_id) REFERENCES department(id) ON DELETE CASCADE
  );
  -- Employee table with foreign key to Role table and to itself
  CREATE TABLE employee (
    id INT NOT NULL AUTO_INCREMENT,
    first_name VARCHAR(30) NULL,
    last_name VARCHAR(30) NULL,
    role_id INT NOT NULL,
    manager_id INT NULL,
    PRIMARY KEY (id),
    CONSTRAINT fk_role FOREIGN KEY (role_id) REFERENCES role(id) ON DELETE CASCADE,
    CONSTRAINT fk_employee FOREIGN KEY (manager_id) REFERENCES employee(id) ON DELETE
    SET NULL
  )