7. Create a view and name it as 30YearsStaff" using F_Staffs table with the following columns; First_name, Birthdate after adding 120 Months and name it as "Age" and OVERTIME_RATE with the name of "Overtime". Restrict the output for all F_Staffs, whose salary is greater 600 and First_name has letter "a" or who is not having Manager_ID. Arrange the output on First_name in alphabetic order. [6 Marks]