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 Courses (course_name VARCHAR, course_id VARCHAR); CREATE TABLE Student_Course_Enrolment (course_id VARCHAR)
### Question:
What are the names of the courses that have exactly 1 student enrollment?
### Answer:
SELECT T1.course_name FROM Courses AS T1 JOIN Student_Course_Enrolment AS T2 ON T1.course_id = T2.course_id GROUP BY T1.course_name HAVING COUNT(*) = 1