text: DROP DATABASE IF EXISTS employee_tracker_db;
  CREATE DATABASE employee_tracker_db;
  
  USE employee_tracker_db;
  
  
  
  CREATE TABLE department (
      id INT NOT NULL AUTO_INCREMENT PRIMARY KEY,
      name VARCHAR(30) NOT NULL
  );
  
  CREATE TABLE role(
      id INT NOT NULL AUTO_INCREMENT PRIMARY KEY,
      title VARCHAR(30) NOT NULL,
      salary INT NOT NULL,
      department_id INT NOT NULL,
      FOREIGN KEY (department_id) REFERENCES department(id) ON DELETE CASCADE
  );
  
  CREATE TABLE employee (
      id INT NOT NULL 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) ON DELETE CASCADE,
      FOREIGN KEY (manager_id) REFERENCES employee(id) ON DELETE CASCADE
  );