SELECT T1.student_id, T2.middle_name FROM Student_Course_Enrolment AS T1 JOIN Students AS T2 ON T1.student_id = T2.student_id GROUP BY T1.student_id HAVING COUNT(*) <= 2
Temukan ID siswa dan nama tengah untuk semua siswa dengan paling banyak dua pendaftaran.
CREATE TABLE Student_Course_Enrolment (student_id VARCHAR); CREATE TABLE Students (middle_name VARCHAR, student_id VARCHAR)