Using the HR database write and execute the following SQL queries: 1. Write a query in SQL to display the first name, last name, department number and department name, for all employees works on departments 80 or 40. 2. Write a query in SQL to display the first name, last name, department number and department name, for all employees who have or have not any employee. 3. Write a query in SQL to display the first name, last name, department number and name, for all employees who have or have not any department. 4. Write a query in SQL to display the first name, last name, a department number and name, for all employees where city name is 'Tokyo