text: DROP DATABASE IF EXISTS employeeDB;
  CREATE DATABASE employeeDB;
  USE employeeDB;
  CREATE TABLE department (
    id INT NOT NULL AUTO_INCREMENT,
    name VARCHAR(256) NULL,
    PRIMARY KEY (id)
  );
  
  CREATE TABLE role (
    id INT NOT NULL AUTO_INCREMENT,
    title VARCHAR(45) NULL,
    salary DECIMAL NOT NULL,
    dept_id INT REFERENCES department.id,
    PRIMARY KEY (id)
  );
  
  CREATE TABLE employee (
    id INT NOT NULL AUTO_INCREMENT,
    first_name VARCHAR(256) NULL,
    last_name VARCHAR(256) NULL,
    role_id INT REFERENCES role.id,
    manager_id INT,
    PRIMARY KEY (id)
  );