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1、数据库sql查询语句练习2习题结果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： Teacher表： 根据上面描述完成下面问题： 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cl
2、ass降序输出student的所有记录 命令：select * from Student order by class desc; 4. 列出教师所在的单位depart。 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
3、王%;或 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 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 命令：select * from Student where class=95001 or sex=女; 9. 以cno升序、degree降序输出score的所有记录。 命令：
4、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 degree85; 12. 输出95001班级的学生人数 命令：select COUNT(*) from Student where class=95001; 13. 输出3-105号课程的
5、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。 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：se
6、lect 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 Stud
7、ent.no,name from Student join Score on Student.no=Score.no group by Student.no,name having MAX(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 Co in(select cno from Score group by cno having COUNT(So)5); 19. 输出95001班级所选课程的课程号和平均分 命令：sel
8、ect 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
9、 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
10、 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 命令：select cname from Course where cno in (select distinct cno from Score where degree85);或 select distinct cname from Course join Score on Co=So where degree85; 23. 列出“计
11、算机系”教师所教课程的成绩表。 命令：select Co,cname,Student.name,DEGREE from Teacher join Course on Teacher.no=Course.tno join Score on Co=So 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和 命select a.name,a.prof,b.name,b.prof from (select name,prof,dep
12、art 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。 命令：select a.no,a.name,b.no,b.name from Student a join Student b on not a.
13、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 Co=So join Student on Score.no=Student.no where Teacher.name=张三; 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 jo
14、in Course on Teacher.no=Course.tno join Score on Co=So; 28. 输出所有学生的name、no和degree。 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; 29. 列出所有任课教师的name和depart。 命令：select distinct name,dep
15、art 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 Co=So; 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 fr
16、om 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 join Course on So=Co 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 Co,Score.no,DEGREE from Course jo
17、in Score on Co=So join Student on Score.no=Student.no where Co=3-105 and Score.degree(select max(degree) from Score where So=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 Studen
18、t.no,name from Student join Score on Student.no =Score.no where So=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_degr
19、ee) on So=o where Score.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。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 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_degreeb.avg_degree;
