CREATE TABLE Students (personal_name VARCHAR, student_id VARCHAR)
CREATE TABLE Student_Course_Enrolment (student_id VARCHAR)

Find the student ID and personal name of the student with at least two enrollments.
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
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