The schema of the database is provided below (keys are in bold and underlined, field types are omitted):

student(sid, sname, sex, age, year, gpa)

dept(dname, numphds)

prof(pname, dname)

course(cno, cname, dname)

major(dname, sid)

section(dname, cno, sectno, pname)

enroll(sid, grade, dname, cno, sectno)

For each Computer Sciences class, print the cno, sectno, and the average gpa of the students enrolled in the class