Given the database table named Staff, answer the following questions using the SQL statements. List staff number, first name, last name and monthly salaries (the above salaries are annual). List first and last name of staff whose position is Manager or Assistant. Insert a record (SP03, John, Doe, Assistant, 55000) Delete a record(s) of staff with a salary greater than 50,000 Update a record or staft's position to Manager where StaffNo is SA09