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)                         

表（二）Course（课程表）

表（三）Score(成绩表)

表（四）Teacher(教师表)

表1-2数据库中的数据

表（一）Student

表（二）Course

表（三）Score

表（四）Teacher

--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。
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 t.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) 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,score.cno,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 Score.cno=course.cno
--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 on teacher.tno=course.tno 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 on teacher.tno=course.tno
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
course.tno=teacher.tno 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 s1.cno=s2.cno)
--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 where a.tno=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 where a.tno=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 on course.tno=teacher.tno 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‘)

学生选课系统数据库SQL语句考试题