text: DROP DATABASE IF EXISTS employee_db;
  CREATE DATABASE employee_db;
  
  USE employee_db;
  
  -- Create Department Table
  CREATE TABLE department(
      id INT NOT NULL AUTO_INCREMENT PRIMARY KEY,
      name VARCHAR(30) NOT NULL,
  );
  
  -- Create Role Table --
  CREATE TABLE role(
      id INT NOT NULL AUTO_INCREMENT PRIMARY KEY,
      title VARCHAR(30) NOT NULL,
      salary DECIMAL NOT NULL,
      department_id INT,
  );
  
  -- Create Employee Role --
  CREATE TABLE employee(
      id INT PRIMARY KEY AUTO_INCREMENT,
      first_name VARCHAR(30) NOT NULL,
      last_name VARCHAR(30) NOT NULL,
      role_id INT NOT NULL,
      manager_id INT,
      PRIMARY KEY (id),
      FOREIGN KEY (role_id)
      REFERENCES role(id),
      FOREIGN KEY (manager_id)
      REFERENCES
  );