text: -- Creating tables for PH-Employee DB
  CREATE TABLE departments(
  	dept_no VARCHAR(4) NOT NULL,
  	dept_name VARCHAR(40) NOT NULL,
  	PRIMARY KEY (dept_no),
  	UNIQUE(dept_name)
  );
  
  CREATE TABLE employees(
  	emp_no INT NOT NULL,
  	birth_date DATE NOT NULL,
  	first_name VARCHAR NOT NULL,
  	last_name VARCHAR NOT NULL,
  	gender VARCHAR NOT NULL,
  	hire_date DATE NOT NULL
  );