query: SELECT student_id FROM students WHERE student_id NOT IN (SELECT student_id FROM student_course_attendance)
question: What-all  ids every student what which never attends the 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 ids every student what which never attends the course?