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
Apa nama -nama kursus yang memiliki 1 pendaftaran siswa?
CREATE TABLE Courses (course_name VARCHAR, course_id VARCHAR); CREATE TABLE Student_Course_Enrolment (course_id VARCHAR)