SELECT personal_name FROM Students EXCEPT SELECT T1.personal_name FROM Students AS T1 JOIN Student_Course_Enrolment AS T2 ON T1.student_id = T2.student_id
Temukan nama pribadi siswa yang tidak terdaftar dalam kursus apa pun.
CREATE TABLE Student_Course_Enrolment (student_id VARCHAR); CREATE TABLE Students (personal_name VARCHAR); CREATE TABLE Students (personal_name VARCHAR, student_id VARCHAR)