数据库sql查询语句练习2_习题_结果(单世民)

数据库sql

现在有一教学管理系统，具体的关系模式如下：

Student (no, name, sex, birthday, class)

Teacher (no, name, sex, birthday, prof, depart) Course (cno, cname, tno) Score (no, cno, degree)

其中表中包含如下数据： Course表：

Score表：

Student表：

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数据库sql

Teacher表：

根据上面描述完成下面问题：

（注意：注意保存脚本，尤其是DDL和DML，以便进行数据还原） DDL

1. 写出上述表的建表语句。

2. 给出相应的INSERT语句来完成题中给出数据的插入。

单表查询

3. 以class降序输出student的所有记录（student表全部属性）

命令：select * from Student order by class desc;

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数据库sql

4. 列出教师所在的单位depart（不重复）。

命令：select distinct depart from Teacher;

5. 列出student表中所有记录的name、sex和class列

命令：select name,sex,class from Student;

6. 输出student中不姓王的同学的姓名。

命令：select name from Student except select name from Student where name like '王%';或

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数据库sql

select name from Student where name not like '王%';

7. 输出成绩为85或86或88或在60-80之间的记录（no,cno,degree）

命令：select no,cno,DEGREE from Score where degree=85 or degree=86 or degree=88 or degree between 60 and 80;

8. 输出班级为95001或性别为‘女’ 的同学（student表全部属性）

命令：select * from Student where class=95001 or sex='女';

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数据库sql

9. 以cno升序、degree降序输出score的所有记录。（score表全部属性）

命令：select * from Score order by cno asc,degree desc;

10. 输出男生人数及这些男生分布在多少个班级中

命令：select COUNT(*),count(distinct class) from Student where sex='男';

11. 列出存在有85分以上成绩的课程编号。

命令：select distinct cno from Score where degree>85;

12. 输出95001班级的学生人数

命令：select COUNT(*) from Student where class=95001;

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数据库sql

13. 输出‘3-105’号课程的平均分

命令：select avg(cast(degree as float)) from Score where cno='3-105';

14. 输出student中最大和最小的birthday日期值

命令：select MAX(birthday),MIN(birthday) from Student;

15. 显示95001和95004班全体学生的全部个人信息（不包括选课）。（student表全部属性）

命令：select * from Student where class=95001 or class=95004;

聚合查询

16. 输出至少有5个同学选修的并以3开头的课程的课程号，课程平均分，课程最高分，

课程最低分。

命令：select cno,avg(cast(degree as float)),MAX(degree),MIN(degree) from Score where cno like '3%' group by cno having COUNT(cno)>5; 或者：

select cno,AVG(cast(DEGREE as float)),MAX(degree),MIN(DEGREE) from Score group by cno having COUNT(cno)>=5 and cno like '3%'

17. 输出所选修课程中最低分大于70分且最高分小于90分的学生学号及学生姓名

命令：select Student.no,name from Student join Score on

Student.no=Score.no

group

by

Student.no,name

having

MAX(Score.degree)<90 and MIN(Score.degree)>70;

18. 显示所教课程选修人数多于5人的教师姓名

命令：select name from Teacher join Course on Teacher.no=Course.tno

where Course.cno in(select cno from Score group by cno having COUNT(Score.cno)>5);

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数据库sql

19. 输出’95001’班级所选课程的课程号和平均分

命令：select cno,avg(cast(degree as float)) from Score where no

in(select no from Student where class=95001) group by cno;

或者：

select cno,AVG(cast(degree as float)) from Score join Student on Score.no=Student.no group by cno,class having class='95001'

20. 输出至少有两名男同学的班级编号。

命令：select class from Student where sex='男' group by class having COUNT(class)>=2;

或者：select a.class from (select * from Student where sex='男') a group by a.class having COUNT(a.class)>=2

多表查询

21. 列出与108号同学同年出生的所有学生的学号、姓名和生日

命令：select no,name,birthday from Student where year(birthday)

=(select year(birthday) from Student where no=108);

或者：select b.no,b.name,b.birthday from Student a join Student b on datediff(YEAR,a.birthday,b.birthday)=0 and a.no='108'

22. 列出存在有85分以上成绩的课程名称

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数据库sql

命令：select cname from Course where cno in (select distinct cno from

Score where degree>85);或

select distinct cname from Course join Score on Course.cno=Score.cno where degree>85;

23. 列出“计算机系”教师所教课程的成绩表（课程编号，课程名，学生名，成绩）。

命令：select Course.cno,cname,Student.name,DEGREE from Teacher join

Course on Teacher.no=Course.tno join Score on Course.cno=Score.cno join Student on Score.no=Student.no where Teacher.depart='计算机系';

24. 列出所有可能的“计算机系”与“电子工程系”不同职称的教师配对信息，要求输出

每个老师的姓名（name）和（职称）

命

select a.name,a.prof,b.name,b.prof from (select

name,prof,depart from Teacher where depart='计算机系' or depart='电子工程系') a join (select name,prof,depart from Teacher where depart='电子工程系' or depart='计算机系') b on not a.prof=b.prof and not a.depart=b.depart;

令：

25. 列出所有处于不同班级中，但具有相同生日的学生，要求输出每个学生的学

号和姓名。（提示：使用datediff函数，具体用法可以参考：http://hcmfys.javaeye.com/blog/588844）

命令：select a.no,a.name,b.no,b.name from Student a join Student b on not a.class=b.class and a.birthday=b.birthday;

26. 显示‘张三’教师任课的学生姓名，课程名，成绩

命令：select Student.name,cname,DEGREE from Teacher join Course on

Teacher.no=Course.tno join Score on Course.cno=Score.cno join Student on Score.no=Student.no where Teacher.name='张三';

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数据库sql

27. 列出所讲课已被选修的教师的姓名和系别

命令：select distinct name,depart from Teacher join Course on Teacher.no=Course.tno join Score on Course.cno=Score.cno;

28. 输出所有学生的name、no和degree。（degree为空的不输出和为空的输出两

种情况）。

命令：select name,Student.no,DEGREE from Student left join Score on

Student.no=Score.no;

select name,Student.no,DEGREE from Student join Score on Student.no=Score.no;

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数据库sql

29. 列出所有任课教师的name和depart。（从课程选修和任课两个角度考虑）

命令：select distinct name,depart from Teacher join Course on

Teacher.no=Course.tno;

select distinct name,depart from Teacher join Course on Teacher.no=Course.tno join Score on Course.cno=Score.cno;

30. 输出男教师所上课程名称。

命令：select cname from Teacher join Course on Teacher.no=Course.tno where Teacher.sex='男';

31. 出与“李军”同性别的所有同学的name。

命令：select name from Student where sex=(select sex from Student where name='李军');

32. 输出选修“数据结构”课程的男同学的成绩。

命令：select DEGREE from Score join Student on Score.no=Student.no

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数据库sql

join Course on Score.cno=Course.cno where sex='男' and cname='数据结构';

33. 列出选修编号为‘3-105’课程并且该门课程成绩比课程 ‘3-111’的最高分

要高的cno,no和degree。

命令：select Course.cno,Score.no,DEGREE from Course join Score on

Course.cno=Score.cno join Student on Score.no=Student.no where Course.cno='3-105' and Score.degree>(select max(degree) from Score where Score.cno='3-111');

子查询

34. 输出score中成绩最高的学号和课程号

命令：select no,cno from Score where degree in(select MAX(degree) from Score);

35. 输出选修3-105课程，其成绩高于109号同学在此课程所得成绩的所有同学的学号，姓

名

命令：select Student.no,name from Student join Score on Student.no

=Score.no where Score.cno='3-105' and degree>(select degree from Score where no='109' and cno='3-105');

36. 列出成绩比该课程平均成绩低的同学的学号，成绩和该门课的平均成绩

命令：select no,DEGREE,a.avg_degree from Score join (select

cno,AVG(cast(degree as float)) from Score group by cno) a(cno,avg_degree)

on

Score.cno=a.cno

where

Score.degree

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数据库sql

37. 列出没有实际授课的教师的姓名和系别

命令：select name,depart from Teacher except select name,depart from

Teacher join Course on Teacher.no=Course.tno join Score on Course.cno=Score.cno;

38. 列出选修了编号为‘3-105’课程且其成绩高于‘4-109’课程最高成绩的同学的 课程

编号，学号和成绩

命令：select cno,no,DEGREE from Score where cno='3-105' and degree>(select MAX(degree) from Score where cno='4-109');

39. **列出符合下述条件的所有可能的同学配对（sno1,sname1,sno2,sname2,difference）。

其中要求学号为sno1的sname1同学的所学课程的平均分大于学号为sno2的sname2同学的所学课程平均分，两个同学的课程平均分的差值difference为（sno1同学平均分-sno2同学平均分）

命令：select a.no,a.name,b.no,b.name,a.avg_degree-b.avg_degree as

difference from (select Student.no,name,avg(degree) from Student join Score

on

Student.no=Score.no

group

by

Student.no,name)

a(no,name,avg_degree) join (select Student.no,name,avg(degree) from Student join Score on Student.no=Score.no group by Student.no,name) b(no,name,avg_degree) on a.avg_degree>b.avg_degree;

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数据库sql

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