text: DROP DATABASE IF EXISTS employeeTracker_DB;
  CREATE DATABASE employeeTracker_DB;
  
  USE employeeTracker_DB;
  
  CREATE TABLE department(
    id INT NOT NULL AUTO_INCREMENT,
    name VARCHAR(30) NOT NULL,
    PRIMARY KEY (id)
  );
  
  CREATE TABLE role(
    id INT NOT NULL AUTO_INCREMENT,
    title VARCHAR(30) NOT NULL,
    salary DECIMAL(6.2) NOT NULL,
    department_id INT NOT NULL,
    PRIMARY KEY (id),
    FOREIGN KEY (department_id) REFERENCES department(id)
  );
  
  CREATE TABLE employee(
    id INT NOT NULL 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 employee(id)
  );