学⽣选课系统数据库SQL语句考试题
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
Sno Char(3)否学号（主码）
Sname Char(8)否学⽣姓名
Ssex Char(2)否学⽣性别
Sbirthday datetime可学⽣出⽣年⽉
Class Char(5)可学⽣所在班级
表（⼆）Course（课程表）
属性名数据类型可否为空含义
Cno Char(5)否课程号（主码）
Cname Varchar(10)否课程名称
Tno Char(3)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
Sno Char(3)否学号（外码）
Cno Char(5)否课程号（外
码）
Degree Decimal(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
Tno Char(3)否教⼯编号（主
码）
Tname Char(4)否教⼯姓名
Tsex Char(2)否教⼯性别
Tbirthday datetime可教⼯出⽣年⽉
Prof Char(6)可职称
Depart Varchar(10)否教⼯所在部门
表1-2数据库中的数据
表（⼀）Student
Sno Sname Ssex Sbirthday class
108曾华男1977-09-0195033
105匡明男1975-10-0295031
107王丽⼥1976-01-2395033
101李军男1976-02-2095033
109王芳⼥1975-02-1095031
103陆君男1974-06-0395031
表（⼆）Course
Cno Cname Tno
3-105计算机导论825
3-245操作系统804
6-166数字电路856
9-888⾼等数学831
表（三）Score
Sno Cno Degree
1033-24586
1053-24575
1093-24568
1033-10592
1053-10588
1093-10576
1013-10564
1073-10591
1083-10578
1016-16685
1076-16679
1086-16681
表（四）Teacher
Tno Tname Tsex Tbirthday Prof Depart 804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
--表（⼀）Student (学⽣表)
CREATE table Student
( sno char(3) primary key,
sname char(8),
Ssex char(2),
sbirthday datetime,
class char(5)
)
--表（⼆）Course（课程表）
CREATE table course
( cno char(5) primary key,
cname varchar(10),
tno char(3)
)
--表（三）Score(成绩表)
CREATE table score
( sno char(3),
cno char(5),
degree decimal(4,1)
)
--表（四）Teacher(教师表)
CREATE table teacher
( tno char(3) primary key,
tname char(4),
tsex char(2),
tbirthday datetime,
prof char(6),
depary varchar(10)
)
SELECT *FROM course
SELECT *FROM Student
SELECT *FROM score
SELECT *FROM teacher
INSERT INTO Student VALUES
(108,'曾华','男','1977-09-01',95033)
INSERT INTO Student VALUES
(105,'匡明','男','1975-10-02',95031)
INSERT INTO Student VALUES
(107,'王丽','⼥','1976-01-23',95033)
INSERT INTO Student VALUES
(101,'李军','男','1976-02-20',95033)
INSERT INTO Student VALUES
(109,'王芳','⼥','1975-02-10',95031)
INSERT INTO Student VALUES
(103,'陆君','男','1974-06-03',95031)
INSERT INTO Course VALUES
('3-105','计算机导论',825)
INSERT INTO Course VALUES
('3-245','操作系统',804)
INSERT INTO Course VALUES
('6-166','数字电路',856)
INSERT INTO Course VALUES
('9-888','⾼等数学',831)
INSERT INTO Score VALUES
(103,'3-245',86)
INSERT INTO Score VALUES
(105,'3-245',75)
INSERT INTO Score VALUES
(109,'3-245',68)
INSERT INTO Score VALUES
(103,'3-105',92)
INSERT INTO Score VALUES
(105,'3-105',88)
INSERT INTO Score VALUES
(109,'3-105',76)
INSERT INTO Score VALUES
(101,'3-105',64)
INSERT INTO Score VALUES
(107,'3-105',91)
INSERT INTO Score VALUES
(108,'3-105',78)
INSERT INTO Score VALUES
(101,'6-166',85)
INSERT INTO Score VALUES
(107,'6-166',79)
INSERT INTO Score VALUES
(108,'6-166',81)
INSERT INTO Teacher VALUES
(804,'李诚','男','1958-12-02','副教授','计算机系')
INSERT INTO Teacher VALUES
(856,'张旭','男','1969-03-12','讲师','电⼦⼯程系')
INSERT INTO Teacher VALUES
(825,'王萍','⼥','1972-05-05','助教','计算机系')
INSERT INTO Teacher VALUES
(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 depary 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。sql容易学吗
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 sno DESC
--8、以Cno升序、Degree降序查询Score表的所有记录。
SELECT *FROM score ORDER BY cno
SELECT *FROM score ORDER BY degree DESC
-
-9、查询“95031”班的学⽣⼈数。
SELECT COUNT(*) 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 sno,cno from score WHERE degree=(SELECT MAX(degree) FROM score)
--11、查询每门课的平均成绩。
select avg(t.degree) from SCORE t group by to
--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) as avgdegree from score group by cno having cno='3-105';
--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 Student.sname,scoreo,degree FROM Student,score WHERE Student.sno=score.sno --15、查询所有学⽣的Sno、Cname和Degree列。
SELECT Student.sno,sname,score.degree FROM Student,score WHERE Student.sno=score.sno --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 Scoreo=courseo
--17、查询“95033”班学⽣的平均分。
select avg(degree) as avgdegree from score
where sno in(select sno from student where class='95033')
--18、假设使⽤如下命令建⽴了⼀个grade表：
create table grade
( low int,
upp int,
rank char(1)
)
insert into grade values(90,100,'A')
insert into grade values(80,89,'b')
insert into grade values(70,79,'C')
insert into grade values(60,69,'D')
insert into grade values(0,59,'E')
select sno,cno, (case
when degree between 90 and 100 then 'A'
when degree between 80 and 89 then 'B'
when degree between 70 and 79 then 'C'
when degree between 60 and 69 then 'D'
when degree between 0 and 59 then 'E' END)
as rank from score
--现查询所有同学的Sno、Cno和rank列。
SELECT *FROM grade
--19、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'and degree>
(select degree from score where sno='109' and cno='3-105')
--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 t.sno from SCORE t where t.degree<
(select max(t.degree) from SCORE t) group by sno having count(cno)>1
--21、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 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,sbirthday from student
where datepart(year,sbirthday)=
(select datepart(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=
(select cno from course
join 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 join course =
where cno in (select cno from score group by cno having count(*)>5)
--25、查询95033班和95031班全体学⽣的记录。
select * from student where class in('95033','95031');
--26、查询存在有85分以上成绩的课程Cno.
select distinct cno from score where degree>85;
--27、查询出“计算机系“教师所教课程的成绩表。
select cno,sno,degree from score where cno in
(select cno from course ,teacher where
<= and teacher.depary='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 a where prof not in (select prof from teacher b where b.depary != a.depary)
--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Degree从⾼到低次序排序。select * from score where cno='3-105' and degree
>any (select degree from score where cno='3-245')
order by degree desc
--30、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>all
(select degree from score where cno='3-245') order by degree desc
--31、查询所有教师和同学的name、sex和birthday.
select tname,tsex,tbirthday from teacher union select sname,ssex,sbirthday from student
--32、查询所有“⼥”教师和“⼥”同学的name、sex和birthday.
select tname,tsex,tbirthday from teacher where tsex='⼥'
union select sname,ssex,sbirthday from student where ssex='⼥'
--33、查询成绩⽐该课程平均成绩低的同学的成绩表。
select * from score as s1 where
degree< (select avg(degree) from
score as s2 group by cno having s1o=s2o)
--34、查询所有任课教师的Tname和Depart.
select tname,a.depary from teacher a where exists(select * from course b =b.tno)
--35 、查询所有未讲课的教师的Tname和Depart.
select tname,a.depary from teacher a where not exists(select * from course b =b.tno)
select tname,depary from teacher where tno not in
( select tno from course where cno in( select distinct cno from score))
--36、查询⾄少有2名男⽣的班号。
select class from student group by class,ssex having ssex='男' and count(ssex)>1
--37、查询Student表中不姓“王”的同学记录。
SELECT * FROM Student WHERE sno NOT IN (select sno from student WHERE sname LIKE '王%')
--38、查询Student表中每个学⽣的姓名和年龄。
select sname,datediff(year,Sbirthday,current_timestamp) from student
--39、查询Student表中最⼤和最⼩的Sbirthday⽇期值。
SELECT top 1 sbirthday FROM Student ORDER BY sbirthday
SELECT TOP 1 sbirthday FROM Student ORDER BY sbirthday desc
--40、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
--41、查询“男”教师及其所上的课程。
select tname,tsex,cname from teacher left join course = where tsex='男' --42、查询最⾼分同学的Sno、Cno和Degree列。
SELECT TOP 1 *FROM score ORDER BY degree DESC
--43、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')
--44、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')
and sname not in ('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 *FROM score WHERE sno IN (SELECT sno FROM Student WHERE Ssex='男'
) AND cno =(SELECT cno FROM course WHERE cname='计算机导论')

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