query: SELECT semester_name FROM Semesters WHERE semester_id NOT IN( SELECT semester_id FROM Student_Enrolment )
question: What-what name of semester with no students enrolled?
query_toks: SELECT semester_name FROM Semesters WHERE semester_id NOT IN ( SELECT semester_id FROM Student_Enrolment )
query_toks_no_value: select semester_name from semesters where semester_id not in ( select semester_id from student_enrolment )
question_toks: What-what name of semester with no students enrolled?