text: DROP DATABASE IF EXISTS employees_db;
  
  CREATE DATABASE employees_db;
  
  USE employees_db;
  
  CREATE TABLE employees(
  	id INT AUTO_INCREMENT,
  	first_name VARCHAR(30),
  	last_name VARCHAR(30),
  	role_id INT,
  	manager_id INT,
  	PRIMARY KEY(id)
  );
  
  CREATE TABLE roles(
  	id INT AUTO_INCREMENT,
  	title VARCHAR(30),
  	salary DECIMAL(10,2),
  	department_id INT,
  	PRIMARY KEY(id)
  );
  
  CREATE TABLE departments(
  	id INT AUTO_INCREMENT PRIMARY KEY,
  	name VARCHAR(30)
  );