$14\mathrm{.}28.$ Consider the relation $R,$ which has attributes that hold schedules of courses and sections at

a university; Course$\_$no$,$ Sec$\_$no$,$ Offering$\_$dept, Credit$\_$hours, Course$\_$level,

Instructor$\_$ssn$,$ Semester, Year, Days$\_$hours, Room$\_$no$,$ No$\_$of$\_$students