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이예진: [SQL] Students and Examinations_241205

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	`1`	`+SELECT`
	`2`	`+ s.student_id, s.student_name, su.subject_name, COUNT(e.subject_name) attended_exams`
	`3`	`+FROM Students s`
	`4`	`+CROSS JOIN Subjects su`
	`5`	`+LEFT JOIN Examinations e`
	`6`	`+ON s.student_id = e.student_id AND su.subject_name = e.subject_name`
	`7`	`+GROUP BY s.student_id, s.student_name, su.subject_name`
	`8`	`+ORDER BY s.student_id, su.subject_name`

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