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 |
varchar (20) |
否 |
学号（主码） |
|
Sname |
varchar (20) |
否 |
学生姓名 |
|
Ssex |
varchar (20) |
否 |
学生性别 |
|
Sbirthday |
datetime |
可 |
学生出生年月 |
|
Class |
varchar (20) |
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 |
varchar (20) |
否 |
课程号（主码） |
|
Cname |
varchar (20) |
否 |
课程名称 |
|
Tno |
varchar (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 |
|
Sno |
varchar (20) |
否 |
学号（外码） |
|
Cno |
varchar (20) |
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 |
varchar (20) |
否 |
教工编号（主码） |
|
Tname |
varchar (20) |
否 |
教工姓名 |
|
Tsex |
varchar (20) |
否 |
教工性别 |
|
Tbirthday |
datetime |
可 |
教工出生年月 |
|
Prof |
varchar (20) |
可 |
职称 |
|
Depart |
varchar (20) |
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 |
1977-09-01 |
95033 |
|
105 |
匡明 |
男 |
1975-10-02 |
95031 |
|
107 |
王丽 |
女 |
1976-01-23 |
95033 |
|
101 |
李军 |
男 |
1976-02-20 |
95033 |
|
109 |
王芳 |
女 |
1975-02-10 |
95031 |
|
103 |
陆君 |
男 |
1974-06-03 |
95031 |
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 |
|
103 |
3-245 |
86 |
|
105 |
3-245 |
75 |
|
109 |
3-245 |
68 |
|
103 |
3-105 |
92 |
|
105 |
3-105 |
88 |
|
109 |
3-105 |
76 |
|
101 |
3-105 |
64 |
|
107 |
3-105 |
91 |
|
108 |
3-105 |
78 |
|
101 |
6-166 |
85 |
|
107 |
6-166 |
79 |
|
108 |
6-166 |
81 |
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 |
#1、 查询Student表中的所有记录的Sname、Ssex和Class列。
#2、 查询教师所有的单位即不重复的Depart列。
#3、 查询Student表的所有记录。
#4、 查询Score表中成绩在60到80之间的所有记录。
#5、 查询Score表中成绩为85，86或88的记录。
#6、 查询Student表中“95031”班或性别为“女”的同学记录。
#7、 以Class降序查询Student表的所有记录。
#8、 以Cno升序、Degree降序查询Score表的所有记录。
#9、 查询“95031”班的学生人数。
#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）
#11、 查询每门课的平均成绩。
#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。
#13、查询分数大于70，小于90的Sno列。
#14、查询所有学生的Sname、Cno和Degree列。
#15、查询所有学生的Sno、Cname和Degree列。
#16、查询所有学生的Sname、Cname和Degree列。
#17、 查询“95033”班学生的平均分。
#18、 假设使用如下命令建立了一个grade表：
create table grade(low int(3),upp int(3),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’)
现查询所有同学的Sno、Cno和rank列。
#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。
#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。
#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。
#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。
#23、查询“张旭“教师任课的学生成绩。
#24、查询选修某课程的同学人数多于5人的教师姓名。
#25、查询95033班和95031班全体学生的记录。
#26、 查询存在有85分以上成绩的课程Cno.
#27、查询出“计算机系“教师所教课程的成绩表。
#28、查询“计算 机系”与“电子工程系“不同职称的教师的Tname和Prof。
#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。
#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.
#31、 查询所有教师和同学的name、sex和birthday.
#32、查询所有“女”教师和“女”同学的name、sex和birthday.
#33、 查询成绩比该课程平均成绩低的同学的成绩表。
#34、 查询所有任课教师的Tname和Depart.
#35 、 查询所有未讲课的教师的Tname和Depart.
#36、查询至少有2名男生的班号。
#37、查询Student表中不姓“王”的同学记录。
#38、查询Student表中每个学生的姓名和年龄。
#39、查询Student表中最大和最小的Sbirthday日期值。
#40、以班号和年龄从大到小的顺序查询Student表中的全部记录。
#41、查询“男”教师及其所上的课程。
#42、查询最高分同学的Sno、Cno和Degree列。
#43、查询和“李军”同性别的所有同学的Sname.
#44、查询和“李军”同性别并同班的同学Sname.
#45、查询所有选修“计算机导论”课程的“男”同学的成绩表。
1.select sname,ssex,class from student
2.select distinct depart from teacher
3.select * from student
4.select * from score where degree between 60 and 80
5.select * from score where degree in (85,86,88)
6.select * from student where class='95031' or ssex='女'
7.select * from student order by class desc
8.select * from score order by cno,degree desc
9.select count(*) from student where class='95031'
10.select sno,cno from score order by degree desc limit 0,1
select sno,cno from score where degree = (select max(degree) from score)
11.select avg(degree),cno from score group by cno
12.select avg(degree) from score where cno in(select cno from score group by cno having count(*)>4 ) and cno like '3%'
select avg(degree) from score where cno like '3%' group by cno having count(*)>4
13.select sno from score where degree>70 and degree<90
14.select sname,cno,degree from student,score where student.sno = score.sno
15.select sno,cname,degree from course,score where course.cno = score.cno
16.select sname,cname,degree from student,course,score where student.sno=score.sno and course.cno = score.cno
select sname.cname.degree from student join score on student.sno=score.sno join course on course.cno=score.cno
17.select avg(degree) from score where sno in(select sno from student where class='95033' )
18.select sno,cno,rank from score,grade where degree between low and upp
19.select * from score where cno='3-105' and degree>(select max(degree) from score where sno='109')
select * from score where cno='3-105' and degree>(select max(degree) from score where sno='109' and cno='3-105')
20.select * from score where sno in(select sno from score group by sno having count(*)>1) and degree<(select max(degree) from score where sno in(select sno from score group by sno having count(*)>1))
select * from score a where sno in(select sno from score group by sno having count(*)>1) and degree<(select max(degree) from score b where b.cno = a.cno )
21.select * from score where degree>(select degree from score where sno='109' and cno='3-105')
22.select * from student year(sbirthday) = (select year(sbirthday) from student where sno='108')
23.select * from score where cno in(select cno from course where tno = (select tno from teacher where tname='张旭'))
24.select tname from teacher where tno=(select tno from course where cno = (select cno from score group by cno having count(*)>5))
25.select * from student where class in('95033','95031')
26.select distinct cno from score where degree>85
27.select * from score where cno in(select cno from course where tno in(select tno from teacher where depart='计算机系'))
28.select tname,prof from teacher where depart='计算机系' and prof not in(select prof from teacher where depart='电子工程系' )union
select tname,prof from teacher where depart='电子工程系' and prof not in(select prof from teacher where depart='计算机系')
29.select * from score where cno='3-105' and degree>any(select degree from score where cno='3-245')
30.select * from score where cno='3-105' and degree>all(select degree from score where cno='3-245')
31.select sname,ssex,sbirthday from student
union
select tname,tsex,tbirthday from teacher
32.select sname,ssex,sbirthday from student where ssex='女'
union
select tname,tsex,tbirthday from teacher where tsex='女'
33.select * from score a where degree<(select avg(degree) from score b where b.cno=a.cno )
34.select tname,depart from teacher where tno in(select tno from course )
35.select tname,depart from teacher where cno in(select tno from course where cno not in(select distinct cno from score))
36.select class from student where ssex='男' group by class having count(*)>1
37.select * from student where sname not like '王%'
38.select sname,year(now())-year(sbirthday) from student
39.select max(sbirthday),min(sbirthday) from student
40.select * from student order by class desc,sbirthday
41.select tname,cname from course,teacher where course.tno=teacher.tno and teacher.tsex='男'
42.select * from score where degree=(select max(degree) from score)
select * from score order by degree desc limit 0,1
43.select sname from student where ssex=(select ssex from student where sname='李军')
44.select sname from student where ssex=(select ssex from student where sname='李军') and class=(select class from student where sname='李军')
45.select * from score where cno=(select cno from course where cname='计算机导论') and sno in(select sno from student where ssex='男')