使用分組查詢學生相關信息

查詢每一個年級的總學時數,並按照升序 SELECT GradeId,COUNT(ClassHour) FROM dbo.Subject GROUP BY GradeId ORDER BY COUNT(ClassHour) 查詢每一個參加考試的學員的平均分 SELECT StudentNo,AVG(StudentResult) FROM dbo.Result GROUP BY StudentNo 查

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