Database: e_learning
Question: Which student are enrolled in at least two courses? Give me the student ID and personal name.
SQL:
SELECT T1.student_id ,  T2.personal_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