text: DROP DATABASE IF EXISTS employeeTracker_db;
  CREATE DATABASE employeeTracker_db;
  USE employeeTracker_db;
  
  CREATE TABLE edepartment (
    id INT NOT NULL AUTO_INCREMENT,
    name VARCHAR(30) ,
    PRIMARY KEY (id)
  );
  
  CREATE TABLE erole (
    id INT NOT NULL AUTO_INCREMENT,
    title VARCHAR(30),
    salary decimal,
    department_id INT,
    PRIMARY KEY (id),
    FOREIGN KEY (department_id) REFERENCES edepartment(id)
  );
  
  CREATE TABLE employee (
    id INT NOT NULL AUTO_INCREMENT,
    first_name VARCHAR(30),
    last_name VARCHAR(30),
    role_id int,
    manager_id INT,
    PRIMARY KEY (id),
    FOREIGN KEY (role_id) REFERENCES erole(id),
    FOREIGN KEY (manager_id) REFERENCES employee(id)
  );