What are the first names of all teachers who have taught a course and the corresponding descriptions?
SELECT T2.emp_fname ,  T3.crs_description FROM CLASS AS T1 JOIN employee AS T2 ON T1.prof_num  =  T2.emp_num JOIN course AS T3 ON T1.crs_code  =  T3.crs_code
first names of teachers = T2.emp_fname; teachers who have taught a course = JOIN between CLASS and employee on prof_num = emp_num; corresponding course descriptions = T3.crs_description; JOIN between CLASS and course on crs_code = crs_code;