query: SELECT student_id FROM students WHERE student_id NOT IN (SELECT student_id FROM student_course_attendance)
question: What-all are the  ids of every student ain't attended no course?
query_toks: SELECT student_id FROM students WHERE student_id NOT IN ( SELECT student_id FROM student_course_attendance )
query_toks_no_value: select student_id from students where student_id not in ( select student_id from student_course_attendance )
question_toks: What-all are the ids of every student ain't attended no course?