--1. 查詢 “計算機 系”的班級信息。

select *from Class where DepartmentID=(select DepartmentID from Department where DepartmentName='計算機系')

--2. 查詢“計算機系”的全部學生信息。

select *from Studentinner join Class on Class.ClassID=Student.ClassIDwhere Class.DepartmentID=(select DepartmentID from Department where DepartmentName='計算機系')

--3. 查詢Dp010001課程中成績未達到該門課程平均分的選課信息。

select *from Courseinner join Grade on Course.CourseID=Grade.CourseIDwhere Course.CourseID ='Dp010001' and Grade<(select avg(Grade) from Grade where CourseID='Dp010001')

--4. 查詢Dp010001課程中最低分的學生信息。

select *from Studentinner join Grade on Student.StudentID=Grade.StudentID where Grade=(select min(Grade)from Grade where CourseID='Dp010001')

--5. 查詢Cs010901班比Cs010902班年齡都大的學生信息。

select *from Studentwhere ClassID='Cs010901'and Birth <all(select Birth from Student where ClassID='Cs010902')

--6. 用帶EXISTS子查詢選修了Dp010001的學生學號和姓名

select StudentID,StudentName from Student where exists(select * from Course where CourseID='Dp010001')

--7. 查詢course表中的最大學分和最小學分的課程名。

select CourseName from Course where credit =(select max(credit)? from Course) or credit=(select min(credit) from Course)

--8.查詢選修了Dp010001課程而沒有選修Dp010002號課程的學生學號。

select StudentID from Grade where CourseID='Dp010001'and CourseID!='Dp010002'

--9.查詢計算機系選修了5門以上課程的學生的學號和姓名。

select Student.StudentID,StudentName from Studentinner join Grade on Grade.StudentID=Student.StudentID?where exists(select DepartmentID from Department where DepartmentName='計算機系')group by Student.StudentID,StudentName having count(Grade)>=5

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