3. course numbers of never tought courses
RO
=
project
grades
on cno
cno
cs110
cs110
cs110
cs110
cs110
cs110
cs240
cs240
cs240
cs410
cs410
cs210
cs210
cs210
cs210
cs210
cs240
cs240
cs240
cs310
cs310
R1
=
project
courses
on cno
cno
cs110
cs210
cs240
cs310
cs350
cs410
cs460
R2
=
difference
of
R1
to
R0
cno
cs460
cs350