《》 mysql实用教程郑阿奇实验报告答案

python实用教程郑阿奇2020-09-28 19:50:10人已围观

SQL Server 实用教程(第3版)课后实验答案 郑阿奇主编的 邮箱344561468@qq.com

--查询全体学生的学号和姓名.

select Sno,Sname from Student

--查询全体学生细记录.

select * from Student

--查询所有选程生学号.

select distinct Sno from SC

--查询考试有格的学生学号.

select distinct Sno from SC where Grade<60

--查询不是信息系(is)、计算机系(cs)的学生性别、年龄、系别。

select Ssex,Sage,Sdept from Student where Sdept not in('is','cs')

--查询选修了4号课的学生学号和成绩,结果按成绩降序排列.

select Student.Sno,Grade from Student,SC where Cno='004' order by Grade desc

--查询每个课程号和相应的选课人数.

select Cno,count(Sno)选课人数 from SC group by Cno

--查询计算机系(cs)的学生姓名、年龄、系别。

select Sno,Sage,Sdept from Student where Sdept in('cs')

--查询年龄18~20岁的学生学号、姓名、系别、年龄。

select Sno,Sname,Sdept,Sage from Student where Sage between 18 and 20

--查询姓刘的学生的情况.

select * from Student where Sname like '刘%'

--查询既选修1号课程,又选修2号课程的学生学号.

select Sno from SC where Cno='001' and Cno='002'

select sno from SC where Cno='001' and Sno in (select Sno from SC where Cno='002')

select sno from SC where Cno='001' intersect select Sno from SC where Cno='002'

--查询学生的姓名和出生年份(今年2008年)

select Sname,2008-Sage as 出生年份 from student

--查询没有成绩的学生学号和课程号。

select Sno,Cno from sc where grade is null

--查询总成绩大于200分的学生学号。

select Sno from sc group by sno having sum(grade)>200

--查询每门课程不及格学生人数。

select cno,count(sno) 不及格人数 from sc where grade<60 group by cno

--查询不及格课程超过3门的学生学号。

select Sno from sc where grade<60 group by sno having count(grade)>3

--查询年龄为10~19岁的学生信息。

select * from student where Sage between 10 and 19

--查询全体学生情况，按所在系升序排列，同一个系的学生按年龄降序排列。

select * from student order by sdept, sage desc

--查询选了1号课程的学生平均成绩。

select avg(grade) from sc where cno='001'

--查询选了3号课程的学生的最高分。

select max(grade) from sc where cno='003'

--查询每个同学的总成绩。

select sno,sum(grade) 总成绩 from sc group by sno

---实验五

--查询每个学生及其选课情况。

select student.*,sc.*,course.* from student,sc,course where student.sno=sc.sno and sc.cno=course.cno

--select * from sc,student,course

--查询每门课程的间接选修课。

select first.cno,second.cpno from course first,course second where first.cpno=second.cno;

--将STUDENT，SC进行右连接。

select * from student,sc

select student.*,sc.* from student right join sc on student.sno=sc.sno

--查询有不及格学生的姓名和所在系。

select Sname,Sdept from student,sc where grade<60 and student.sno=sc.sno

--查询所有成绩为优秀(大于90)的学生姓名。

select Sname from student where sno in (select sno from sc group by sno having min(grade)>90)and sno not in (select sno from sc where grade is null) --错误

select sname from student,sc where student.sno=sc.sno and student.sno not in(select sno from sc where grade is null) group by sname having min(grade)>=90

--查询既选修了2号课程又选修了3号课程的学生姓名、学号。

select distinct Sname,Sc.Sno from student,sc where student.sno=sc.sno and sc.sno in(select sno from sc where cno='002' and sno in (select sno from sc where cno='003'))

--查询和刘晨同一年龄的学生。

select Sno,sname from student where sage=(select sage from student where sname='刘晨')

--选修了课程名为“数据库”的学生姓名和年龄。

select Sname,Sage from student where sno in(select sno from sc where cno=(select cno from course where cname='数据库'))

--查询其他系比IS系任一学生年龄小的学生名单。

select sname from student where sdept!='is'and sage

--查询其他系中比IS系所有学生年龄都小的学生名单。

select Sname from student where sdept!='is' and sage

--查询选修了全部课程的学生姓名.

select sname from student where not exists(select * from course where not exists(select * from sc where sno=student.sno and cno=course.cno)) --正确

--查询计算机系学生及其性别是男的学生.

select * from student where sdept='is' or ssex='男'

--查询选修课程1的学生集合和选修2号课程学生集合的差集。

select sc.sno from student,sc where student.sno=sc.sno and cno='001'

except

select sc.sno from student,sc where student.sno=sc.sno and cno='002'

--或者

select sno from sc where cno='001' and sno not in (select sno from sc where cno='002')

--查询李丽同学不学的课程的课程号.

select distinct cno from sc where cno not in (select cno from student,sc where sname='李丽'and student.sno=sc.sno)

--查询选修了3号课程的学生平均年龄.

select avg(sage) from student where sno in(select sno from sc where cno='003')

--求每门课程学生的平均成绩.

select cno,avg(grade) from sc group by cno

--统计每门课程的学生选修人数(超过3人的人统计)。要求输出课程号和选修人数，结果按人数降序排列，若人数相同，按课程号升序排列。

--查询学号比刘晨大，而年龄比他小的学生姓名。

select sname from student where sno>(select sno from student where sname='刘晨')and sage

--求年龄大于女同学平均年龄的男同学的姓名和年龄。

select sname,sage from student where sage>(select avg(sage) from student where ssex='女')and ssex='男'

--求年龄大于所有女同学年龄的男同学姓名和年龄。

select sname,sage from student where sage>(select max(sage) from student where ssex='女')and ssex='男'

--查询至少选修了08002选修的全部课程的学生号码。

--select cno from sc where sno='08002'

--select sno from sc where cno IN (select cno from sc where sno='08002')

--select * from sc A,sc B where A.SNO=B.SNO

--select * from (select distinct* from sc A,sc B where A.SNO=B.SNO)as e

select distinct sno from sc sc1 where not exists (select * from sc sc2 where sc2.sno='08002' and not exists (select * from sc sc3 where sc3.sno=sc1.sno and sc3.cno=sc2.cno))

--查询08001和08002两个学生都选修的课程的信息。

select course.* from course,sc where sno='08001' and course.cno=sc.cno intersect select course.* from course,sc where sno='08002' and course.cno=sc.cno

--查询跟'08001'同学同姓的学生信息

select * from student where sname like(select left(sname,1) from student where sno='08001') '%'

mysql实用教程郑阿奇实验报告答案

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