S(SNUM,SNAME,MAJOR,CITY)
I(INUM,INAME,DEPT,CITY)
C(CNUM,CNAME,UNITS)
E(SNUM,CNUM,SECNUM,GRADE)
O(INUM,CNUM,SECNUM,TIME,RNUM)

Find CNAME of courses offered by every instructor in the CS dept.

Find SNAME,INAME pairs such that the student is taught by the instructor and they live in the same city.