text: Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
  ### Context:
  CREATE TABLE Students (student_id VARCHAR); CREATE TABLE Student_Course_Enrolment (student_id VARCHAR)
  ### Question:
  How many students did not have any course enrollment?
  ### Answer:
  SELECT COUNT(*) FROM Students WHERE NOT student_id IN (SELECT student_id FROM Student_Course_Enrolment)