数据库查询练习题
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use) 表（⼆）Course（课程表）
属性名SnoSnameSsexSbirthday Class数据类型varchar (20)varchar (20)varchar (20)Datetimevarchar (20)可否为空含 义否学号（主码）否学⽣姓名否学⽣性别可学⽣出⽣年⽉可学⽣所在班级
属性名数据类型Cno
varchar (20)
可否为空含 义否否课程号（主码）课程名称Cnamevarchar (20)
表（三）Score(成绩表) 表（四）属性名数据类型可否为空含 义IdInt
主键 ⾃增Snovarchar (20)否学号Cnovarchar (20)否课程号Degree
Decimal(4,1)
可
成绩
//主码：Sno+ Cno
表1-2数据库中的数据
表（⼀）Student表 （⼆）SnoSnameSsexSbirthdayclass
108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（三）Score 表（四）SnoCnoDegree1033-245861053-245751093-245681033-105921053-105881093-105761013-105641073-105911083-105781016-166851076-16679108
6-166
81
Tno
varchar (20)
否
教⼯编号
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Tbirthdaydatetime可教⼯出⽣年⽉Profvarchar (20)可职称
Depart
varchar (20)
否
教⼯所在部门
Course
CnoCnameTno3-105计算机导论8253-245操作系统8046-166数字电路8569-888
⾼等数学
831
Teacher
TnoTnameTsexTbirthdayProfDepart804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
⼆、习题：
1、 查询Student表中的所有记录的Sname、Ssex和Class列。select sname,ssex,class from student;
2、 查询教师所有的单位即不重复的Depart列。select distinct depart from teacher;
3、 查询Student表的所有记录。select * from student;
4、 查询Score表中成绩在60到80之间的所有记录。 select * from score where degree between 60 and 80;
5、 查询Score表中成绩为85，86或88的记录。select * from score where degree in(85,86,88);
6、 查询Student表中“95031”班或性别为“⼥”的同学记录。 select * from student where class = “95031” or ssex = “⼥”;
7、 以Class降序查询Student表的所有记录。
select * from student order by class desc;
8、 以Cno升序、Degree降序查询Score表的所有记录。Select * from score order by cno,degree desc;
9、 查询“95031”班的学⽣⼈数。
Select count(*),class from student where class = “95031”;
10、 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 max(degree),sno,cno from score;
11、 查询每门课的平均成绩。
Select cno,avg(degree) from score group by cno;
12、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 where cno like “3%” group by cno having count(cno)>4;
13、查询分数⼤于70，⼩于90的Sno列。
Select sno from score where degree between 70 and 90;
14、查询所有学⽣的Sname、Cno和Degree列。
Select sname,cno,degree from student join score on student.sno=score.sno;
15、查询所有学⽣的Sno、Cname和Degree列。
Select sno,cname,degree from course join score on course.cno=score.cno;
16、查询所有学⽣的Sname、Cname和Degree列。
Select sname,cname,degree from student join score on student.sno=score.sno join course on course.cno=score.cno;
17、查询“95033”班学⽣的平均分。
Select class,avg(degree) from score join student on student.sno=score.sno where class =”95033”;
18、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 join student on score.sno = student.sno where cno=”3-105” and degree>( Select max(degree) from score where sno=”109”);
19、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
score.sno,score.cno,score.degree
fromscorejoin
(Select cno,max(degree) d from score group by cno having count(*)>1) aon
score.cno=a.cno and score.degree <> a.d;
20、查询成绩⾼于学号为“109”、课程号为“3-105”的成绩的所有记录。
Select * from score where cno=”3-105” and degree>( Select degree from score where cno = “3-105” and sno=”109”);
21、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,sbirthday from student where sbirthday=(Select sbirthday from student where sno=”108”);
22、查询“张旭“教师任课的学⽣成绩（姓名）。
Select sname,degree from score join student on student.sno=score.sno where cno=(Select cno from course where tno =(Select tno from teacher where tname=”张旭”));
23、查询考计算机导论的学⽣成绩
Select sno,degree from score where cno = (Select cno from course where cname=”计算机导论”);
24、课程名(cname)称为计算机导论 的课程编号
Select cno,cname from course where cname=”计算机导论”;
25、查询李诚⽼师教的课程名称
Select cname from course where tno =(Select tno from teacher where tname=”李诚”);
26、教⾼等数学的导师是哪个系的
Select depart from teacher where tno=(Select tno from course where cname=”⾼等数学”);
27、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=( Select tno from course where cno=( Select cno from score group by cno having count(cno)>5));
28、查询95033班和95031班全体学⽣的记录。 Select * from student where class in(95033,95031);
29、查询成绩表中存在有85分以上成绩的课程Cno. Select cno from score where degree>”85”;
30、查询出“计算机系“教师所教课程的成绩表。
Select * from score where cno in(Select cno from course where tno in( Select tno from teacher where depart=”计算机系”));
31、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 where cno=”3-105” and degree>( Select min(degree) from score where cno=”3-245”);
32、查询所有教师和同学的name、sex和birthday.
Select sname name,ssex sex,sbirthday birthday from studentUnion
Select tname name,tsex sex,tbirthday birthday from teacher;
33、查询所有“⼥”教师和“⼥”同学的name、sex和birthday.
Select sname name,ssex sex,sbirthday birthday from student where ssex=”⼥”Union
Select tname name,tsex sex,tbirthday birthday from teacher where tsex=”⼥”;
34、查询所有成绩⽐3-105课程平均成绩低的同学的成绩表。
Select * from score where degree<( Select avg(degree) from score where cno=”3-105” group by cno);
35、查询所有任课教师的Tname和Depart. Select tname,depart from teacher ;
36、查询所有未讲课的教师的Tname和Depart.
Select tname,depart from teacher where tno not in(Select tno from course where cno in( Select cno from score group by cno));
37、查询⾄少有2名男⽣的班号。
Select class from student where ssex =”男” group by class having count(*)>1;
38、查询Student表中不姓“王”的同学记录。 Select * from student where sname not like “王%”;
39、查询Student表中每个学⽣的姓名和年龄。
Select sname,year(now())-year(sbirthday) from student;
40、查询Student表中最⼤和最⼩的Sbirthday⽇期值。 Select max(sbirthday),min(sbirthday) from student;
41、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,year(now())-year(sbirthday) desc;
42、查询“男”教师及其所上的课程。
Select tname,cname from teacher join course on teacher.tno=course.tno where tsex =”男”;
43、查询最⾼分同学的Sno、Cno和Degree列。
Select student.sno,cno,degree from student join score on student.sno=score.sno where degree=( Select max(degree) from score);
44、查询和“李军”同性别的所有同学的Sname.
Select sname from student where ssex=(Select ssex from student where sname=”李军”);
45、查询和“李军”同性别并同班的同学Sname.
Select sname from student where ssex=(Select ssex from student where sname=”李军”) and class=(Select class from student where sname=”李军”);
46、查询所有选修“计算机导论”课程的“男”同学的成绩表。
Select * from score where cno in (Select cno from course where cname=”计算机导论”) and sno in(Select sno from student where ssex=”男”);
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