Find names of all students who took some course and the course description.
select t1.stu_fname, t1.stu_lname, t4.crs_description from student as t1 join enroll as t2 on t1.stu_num = t2.stu_num join class as t3 on t2.class_code = t3.class_code join course as t4 on t3.crs_code = t4.crs_code