text: drop database if exists employee_trackerdb;
  create database employee_trackerdb;
  
  use employee_trackerdb;
  
  create table employee(
  	id int auto_increment not null,
      first_name varchar(30),
      last_name varchar(30),
      role_id int,
      manager_id int,
      primary key (id)
  );
  
  create table role(
  	id int auto_increment,
      title varchar(30),
      salary decimal(9,2),
      department_id int,
      primary key (id)
  );
  
  create table department(
  	id int auto_increment,
      name varchar(30),
      primary key (id)
  );