SELECT login_name FROM Course_Authors_and_Tutors INTERSECT SELECT login_name FROM Students
What are the login names used both by some course authors and some students?
SELECT login_name FROM Course_Authors_and_Tutors INTERSECT SELECT login_name FROM Students
select login_name from course_authors_and_tutors intersect select login_name from students
What are the login names used both by some course authors and some students ?