Develop the following queries a. List of all employees currently not working for us due to retirement or terminated b. List of all order number, order date, order line number, product number, qty ordered, and customer number c. List of all product number, product name, product category, product brand, qty of product ordered, order number, and orderline number. d. How many each customer have purchased (gross sale or sum of all subtotals) e. How many qty each product category have been ordered