Find the first names of all instructors who have taught some course and the course description.
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
instructors who have taught some course refers to joining the CLASS table with the employee table on a common instructor identifier; first names of all instructors refers to emp_fname from the employee table; course description refers to crs_description from the course table;