query: SELECT T2.emp_fname ,  T4.prof_office ,  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 JOIN professor AS T4 ON T2.emp_num  =  T4.emp_num
question: What are the first names, office locations of all lecturers which taught some course?
query_toks: SELECT T2.emp_fname , T4.prof_office , 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 JOIN professor AS T4 ON T2.emp_num = T4.emp_num
query_toks_no_value: select t2 . emp_fname , t4 . prof_office , 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 join professor as t4 on t2 . emp_num = t4 . emp_num
question_toks: What are the first names, office locations of all lecturers which taught some course?