What are the first names of all teachers who have taught a course and the corresponding course codes?
SELECT T2.emp_fname ,  T1.crs_code FROM CLASS AS T1 JOIN employee AS T2 ON T1.prof_num  =  T2.emp_num
SELECT T2.emp_fname ,  T1.crs_code FROM CLASS AS T1 JOIN employee AS T2 ON T1.prof_num  =  T2.emp_num
[{'EMP_FNAME': 'Arnelle', 'CRS_CODE': 'ACCT-211'}, {'EMP_FNAME': 'Arnelle', 'CRS_CODE': 'ACCT-211'}, {'EMP_FNAME': 'Robert', 'CRS_CODE': 'ACCT-211'}, {'EMP_FNAME': 'Ismael', 'CRS_CODE': 'ACCT-212'}, {'EMP_FNAME': 'Ismael', 'CRS_CODE': 'ACCT-212'}, {'EMP_FNAME': 'Carlos', 'CRS_CODE': 'CIS-220'}, {'EMP_FNAME': 'Gerald', 'CRS_CODE': 'CIS-220'}, {'EMP_FNAME': 'Carlos', 'CRS_CODE': 'CIS-220'}, {'EMP_FNAME': 'Peter', 'CRS_CODE': 'CIS-420'}, {'EMP_FNAME': 'Gerald', 'CRS_CODE': 'QM-261'}, {'EMP_FNAME': 'Gerald', 'CRS_CODE': 'QM-261'}, {'EMP_FNAME': 'Peter', 'CRS_CODE': 'QM-362'}, {'EMP_FNAME': 'Peter', 'CRS_CODE': 'QM-362'}]