1280. Students and Examinations 각 학생들의 시험과목별 응시횟수 조회하기 [내 답안]WITH exams AS ( -- 학생별 시험별 응시횟수SELECT e.student_id, s.student_name, e.subject_name, COUNT(*) AS attended_examsFROM examinations eJOIN students s ON e.student_id = s.student_idGROUP BY e.student_id, s.student_name, e.subject_nameORDER BY e.student_id)SELECT e1.student_id, e3.student_name, e1.subject_name, ..