text: DROP DATABASE IF EXISTS employee_DB;
  CREATE DATABASE employee_DB;
  
  USE employee_DB;
  
  CREATE TABLE Employee(
    id INT NOT NULL AUTO_INCREMENT,
    first_name VARCHAR(30) NOT NULL,
    last_name VARCHAR(30) NOT NULL,
    PRIMARY KEY (id)
  );
  
  CREATE TABLE Role(
    id INT NOT NULL AUTO_INCREMENT,
    title VARCHAR(30) NOT NULL,
    salary DECIMAL,
    PRIMARY KEY (id)
  );
  
  CREATE TABLE Department(
    id INT NOT NULL AUTO_INCREMENT,
    department_name VARCHAR(30),
    PRIMARY KEY (id)
  );