SELECT count(*) FROM Students WHERE student_id NOT IN (SELECT student_id FROM Student_Course_Enrolment)
How many students did not have any course enrollment?
SELECT count ( * ) FROM Students WHERE student_id NOT IN ( SELECT student_id FROM Student_Course_Enrolment )
select count ( * ) from students where student_id not in ( select student_id from student_course_enrolment )
How many students did not have any course enrollment ?