query: SELECT personal_name FROM Students EXCEPT SELECT T1.personal_name FROM Students AS T1 JOIN Student_Course_Enrolment AS T2 ON T1.student_id  =  T2.student_id
question: Students one not enrolled any course? Are Finding their personal name.
query_toks: SELECT personal_name FROM Students EXCEPT SELECT T1.personal_name FROM Students AS T1 JOIN Student_Course_Enrolment AS T2 ON T1.student_id = T2.student_id
query_toks_no_value: select personal_name from students except select t1 . personal_name from students as t1 join student_course_enrolment as t2 on t1 . student_id = t2 . student_id
question_toks: Students one not enrolled any course? Are Finding their personal name.