1) Retrieve project number that has highest work hours.
2) Retrieve department number in which the average of salaries is more than 450, view the result in descending order.
3) Retrieve employee number and name for those who lived in lrbid and have salaries less than 700 and their name end with letter ‘N’?
4) Retrieve all employee’s information for employees hired between 01/01/99 and 01/06/99?