query: SELECT login_name FROM Course_Authors_and_Tutors INTERSECT SELECT login_name FROM Students
question: What-all are the login names use both by some course authors and some students?
query_toks: SELECT login_name FROM Course_Authors_and_Tutors INTERSECT SELECT login_name FROM Students
query_toks_no_value: select login_name from course_authors_and_tutors intersect select login_name from students
question_toks: What-all are the login names use both by some course authors and some students?