sql数据查询练习题.docx

1、sql数据查询练习题一、设有一数据库，包括四个表：学生表（Student）、课程表（Course）、成绩表（Score）以及教师信息表（Teacher）。四个表的结构分别如表1-1的表（一）表（四）所示，数据如表1-2的表（一）表（四）所示。用SQL语句创建四个表并完成相关题目。表1-1数据库的表结构表（一）Student (学生表)属性名数据类型可否为空含义Snovarchar (20)否学号（主码）Snamevarchar (20)否学生姓名Ssexvarchar (20)否学生性别Sbirthdaydatetime可学生出生年月Classvarchar (20)可学生所在班级表（二）Co

2、urse（课程表）属性名数据类型可否为空含义Cnovarchar (20)否课程号（主码）Cnamevarchar (20)否课程名称Tnovarchar (20)否教工编号（外码）表（三）Score(成绩表)属性名数据类型可否为空含义Snovarchar (20)否学号（外码）Cnovarchar (20)否课程号（外码）DegreeDecimal(4,1)可成绩主码：Sno+ Cno表（四）Teacher(教师表)属性名数据类型可否为空含义Tnovarchar (20)否教工编号（主码）Tnamevarchar (20)否教工姓名Tsexvarchar (20)否教工性别Tbirthday

3、datetime可教工出生年月Profvarchar (20)可职称Departvarchar (20)否教工所在部门表1-2数据库中的数据表（一）StudentSnoSnameSsexSbirthdayclass108曾华男1977-09-0195033105匡明男1975-10-0295031107王丽女1976-01-2395033101李军男1976-02-2095033109王芳女1975-02-1095031103陆君男1974-06-0395031表（二）CourseCnoCnameTno3-105计算机导论8253-245操作系统8046-166数字电路8569-888高等数学

4、831表（三）ScoreSnoCnoDegree1033-245861053-245751093-245681033-105921053-105881093-105761013-105641073-105911083-105781016-166851076-166791086-16681表（四）TeacherTnoTnameTsexTbirthdayProfDepart804李诚男1958-12-02副教授计算机系856张旭男1969-03-12讲师电子工程系825王萍女1972-05-05助教计算机系831刘冰女1977-08-14助教电子工程系1、查询Student表中的所有记录的Snam

5、e、Ssex和Class列。select Sname,Ssex,Class from Student2、查询教师所有的单位即不重复的Depart列。select distinct Depart from teacher3、查询Student表的所有记录。select * from student4、查询Score表中成绩在60到80之间的所有记录。select * from Score where Degree between 60and 805、查询Score表中成绩为85，86或88的记录。select * from Score where Degree=85 orDegree=86 or

6、 Degree=886、查询Student表中“95031”班或性别为“女”的同学记录。select * from student where Class=95031or Ssex=女7、以Class降序查询Student表的所有记录。select * from student order by Class desc8、以Cno升序、Degree降序查询Score表的所有记录。select * from Score order by cno asc,Degree desc9、查询“95031”班的学生人数。select count(*) from student whereclass=9503

7、110、查询Score表中的最高分的学生学号和课程号。（子查询或者排序）select Cno,sno from Score where degree in(select MAX(Degree)from Score)11、查询每门课的平均成绩。select avg(degree), cno from Score group bycno12、查询Score表中至少有5名学生选修的并以3开头的课程的平均分数。select AVG(Degree) from Score group by cnohaving count(cno)5 and Cno like 3%13、查询分数大于70，小于90的Sno列

8、。Select Sno from Score where Degree between70 and 9014、查询所有学生的Sname、Cno和Degree列。select Sname,Cno,Degree from Student joinScore on Student.Sno=Score.Sno15、查询所有学生的Sno、Cname和Degree列。select Cname,Sno,Degree from course joinScore on o=So16、查询所有学生的Sname、Cname和Degree列。select Cname,Sname,Degree from course

9、,Score ,Student where Student.Sno=Score.Sno andCo=Score.Cno17、查询“95033”班学生的平均分。select avg(degree) from score,student wherescore.sno=student.sno and class=9503318、假设使用如下命令建立了一个grade表：create table grade(low int(3),upp int(3),rankchar(1)insert into grade values(90,100,A)insert into grade values(80,89,B

10、)insert into grade values(70,79,C)insert into grade values(60,69,D)insert into grade values(0,59,E)现查询所有同学的Sno、Cno和rank列。Select sno,cno,rank from score join gradeon score.Degree between grade.low and grade.upp19、查询选修“3-105”课程的成绩高于“109”号同学成绩的所有同学的记录。select * from Score where cno=3-105 andDegree(selec

11、t degree from Score where cno=3-105 and Sno=109)20、查询score中选学多门课程的同学中分数为非最高分成绩的记录。select * from score a where sno in (Selectsno from score group by sno having count(sno)1) and degree(select degree from Score where Sno=109 and cno=3-105)22、查询和学号为108的同学同年出生的所有学生的Sno、Sname和Sbirthday列。select Sno,Sname,S

12、birthday from Studentwhere YEAR(Sbirthday)=(select YEAR(sbirthday)from Student where Sno=108)23、查询“张旭“教师任课的学生成绩。Select Degree from score where cno=( Selectcno from course where tno=(Select tno from teacher where tname=张旭)24、查询选修某课程的同学人数多于5人的教师姓名。Select tname from teacher where Tno=(selectTno from Co

13、urse where Cno=(select Cno from Score group by Cno havingCOUNT(*)5)25、查询95033班和95031班全体学生的记录。select * from Student where Class=95033or Class=9503126、查询存在有85分以上成绩的课程Cno.select distinct cno from score whereDegree8527、查询出“计算机系“教师所教课程的成绩表。select degree from score where Cnoin(select cno from Course where

14、 Tno in(select tno from Teacher where Depart=计算机系)28、查询“计算机系”与“电子工程系“不同职称的教师的Tname和Prof。select Tname,Prof from teacher where profnot in (select prof from teacher where depart = 计算机系and prof in (select prof from teacher where depart =电子工程系)29、查询选修编号为“3-105“课程且成绩至少高于选修编号为“3-245”的同学的Cno、Sno和Degree,并按De

15、gree从高到低次序排序。select Cno,Sno,Degree from Score whereCno=3-105 and Degree(select MAX(degree)from Score where Cno=3-245)order by Degree desc30、查询选修编号为“3-105”且成绩高于选修编号为“3-245”课程的同学的Cno、Sno和Degree.select Cno,Sno,Degree from Score whereCno=3-105 and Degree(select MAX(degree)from Score where Cno=3-245)31、查

16、询所有教师和同学的name、sex和birthday.select sname as name,ssex as sex,sbirthdayas birthday from Studentunionselect tname ,tsex ,tbirthday from teacher32、查询所有“女”教师和“女”同学的name、sex和birthday.select sname as name,ssex as sex,sbirthdayas birthday from Student where Ssex=女unionselect tname ,tsex ,tbirthday from teac

17、herwhere tsex=女33、查询成绩比该课程平均成绩低的同学的成绩表。Select degree from score a wheredegree=237、查询Student表中不姓“王”的同学记录。select * from student where sname not like王%38、查询Student表中每个学生的姓名和年龄。Selectsname,YEAR(GETDATE()-YEAR(sbirthday) as年龄 from student39、查询Student表中最大和最小的Sbirthday日期值。select MAX(Sbirthday),MIN(Sbirthda

18、y) fromStudent40、以班号和年龄从大到小的顺序查询Student表中的全部记录。select * from Student order by Class desc,Sbirthday ASC41、查询“男”教师及其所上的课程。Select tname,cname from teacher join courseon teacher.tno=course.tno and teacher.tsex=男42、查询最高分同学的Sno、Cno和Degree列。select Sno,Cno,Degree from Score whereDegree in(select MAX(Degree)

19、 from Score)43、查询和“李军”同性别的所有同学的Sname.Select sname from student wheressex=(select ssex from student where sname=李军)44、查询和“李军”同性别并同班的同学Sname.Select sname from student wheressex=(select ssex from student where sname=李军) and Class=(select class from student wheresname=李军)45、查询所有选修“计算机导论”课程的“男”同学的成绩表。 select degree from Score where Snoin(select Sno from Student where Ssex=男)and Cno in (select Cno from Course where cname=计算机导论)