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 |
#建学生信息表student create table student ( sno varchar(20) not null primary key, sname varchar(20) not null, ssex varchar(20) not null, sbirthday datetime, class varchar(20) ); #建立教师表 create table teacher ( tno varchar(20) not null primary key, tname varchar(20) not null, tsex varchar(20) not null, tbirthday datetime, prof varchar(20), depart varchar(20) not null ); #建立课程表course create table course ( cno varchar(20) not null primary key, cname varchar(20) not null, tno varchar(20) not null, foreign key(tno) references teacher(tno) ); #建立成绩表 create table score ( sno varchar(20) not null primary key, foreign key(sno) references student(sno), cno varchar(20) not null, foreign key(cno) references course(cno), degree decimal ); #添加学生信息 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\'); #添加教师表 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\'); #添加课程表 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\'); #添加成绩表 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(\'103\',\'3-105\',\'64\'); insert into score values(\'105\',\'3-105\',\'91\'); insert into score values(\'109\',\'3-105\',\'78\'); insert into score values(\'103\',\'6-166\',\'85\'); insert into score values(\'105\',\'6-166\',\'79\'); insert into score values(\'109\',\'6-166\',\'81\');
1、 查询Student表中的所有记录的Sname、Ssex和Class列。
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select Sname,Ssex,Class from student
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2、 查询教师所有的单位即不重复的Depart列。
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select distinct Depart from teacher
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3、 查询Student表的所有记录。
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select * from student
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4、 查询Score表中成绩在60到80之间的所有记录。
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select * from Score where Degree between 60 and 80
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5、 查询Score表中成绩为85，86或88的记录。
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select * from Score where Degree in(85,86,88)
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6、 查询Student表中“95031”班或性别为“女”的同学记录。
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select * from Student where class=\'95031\' or Ssex=\'女\'
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7、 以Class降序查询Student表的所有记录。
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select * from student order by class desc
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8、 以Cno升序、Degree降序查询Score表的所有记录。
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select * from Score order by cno asc,degree desc
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9、 查询“95031”班的学生人数。
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select count(*) from student where class=\'95031\'
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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）
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select Sno,Cno from Score where Degree=(select max(Degree) from Score)
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select Sno,Cno from Score order by Degree desc limit 0,1
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11、 查询每门课的平均成绩。
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select Cno,avg(degree) from Score group by Cno
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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。
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select avg(Degree) from score where Cno like \'3%\' and Cno in (select Cno from score group by Cno having count(*)>=5) 用in 不用= 是因为可能会有多个
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简单写法：select avg(Degree) from score where Cno like \'3%\' and group by Cno having count(*)>=5
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13、 查询分数大于70，小于90的Sno列。
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select Sno from Score where degree>70 and degree<90
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14、 查询所有学生的Sname、Cno和Degree列。
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select Sname, Cno,Degree from Score , student where Score.Sno=student.Sno
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15、 查询所有学生的Sno、Cname和Degree列。
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select Sno,Cname,Degree from Score , Course where Score.Cno=Course.Cno
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16、 查询所有学生的Sname、Cname和Degree列。
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select Sname,Cname,Degree from student,course,score where student.Sno=score.Sno and course.Cno=score.Cno
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join .. on 写法：select Sname,Cname,Degree from student join score on student.Sno=score.Sno join course on course.Cno=score.Cno
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17、 查询“95033”班学生的平均分。
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select avg(degree) as \'class=95033\' from Score where Sno in (select Sno from Student where Class=\'95033\' )
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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。
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select Sno,Cno,rank from Score,grade where degree between low and upp
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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。
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<span style="color: #000000; font-size: 15px">109同学，选修是3-105课的</span>
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select * from score where Cno=\'3-105\' and degree>(select max(degree ) from Score where Sno=\'109\' and Cno=\'3-105\' )
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<span style="font-size: 15px">109同学，没有选修3-105课</span>
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select * from score where Cno=\'3-105\' and degree>(select max(degree ) from Score where Sno=\'109\')
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and degree<( select max(degree ) from Score where sno in (select Sno from score group by Sno having count(*)>1))
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选了多门课程并且是这个课程下不是最高分的 |
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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)
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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。
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Select * from score where degree>(select degree from Score where Sno=\'109\' and Cno=\'3-105\' )
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22、查询和学号为108、101的同学同年出生的所有学生的Sno、Sname和Sbirthday列。
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select sno,sname,sbirthday from student where year(sbirthday) = (select year(sbirthday) from student where sno=\'108\')
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select sno,sname,sbirthday from student where year(sbirthday) = (select year(sbirthday) from student where sno=\'101\')
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23、查询“张旭“教师任课的学生成绩。
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select Sno,degree from score,Course where score.Cno=Course.Cno and Course.Tno= (select Tno from Teacher where Tname=\'张旭\' )
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select degree from score where Cno in (select cno from course where Tno= (select Tno from Teacher where Tname=\'张旭\' ) )
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24、查询选修某课程的同学人数多于5人的教师姓名。
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select Tname from Teacher, Course where Teacher.Tno=Course.Tno and Course.Cno =(select Cno from Score group by Cno having count(*)>5)
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select Tname from Teacher where tno=( select Tno from Course where cno=( select Cno from Score group by Cno having count(*)>5 ))
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25、查询95033班和95031班全体学生的记录。
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select * from student where class in (\'95033\',\'95031\')
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26、 查询存在有85分以上成绩的课程Cno.
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select Cno from score where degree>85
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27、查询出“计算机系“教师所教课程的成绩表。
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select * from course where cno in (select cno from course where tno in (select tno from teacher where Depart=\'计算机系\'))
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28、查询“计算 机系”与“电子工程系“不同职称的教师的Tname和Prof。
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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\')<br>union <br>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\')
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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。
any:代表括号中任意一个成绩就可以
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select Cno,Sno,Degree from score where cno=\'3-105\' and degree >any(select degree from score where cno=\'3-245\' ) order by degree desc
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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.
all:代表括号中的所有成绩
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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
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31、 查询所有教师和同学的name、sex和birthday.
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select tname,tsex,tbirthday from Teacher union select sname,ssex,sbirthday from Student
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32、查询所有“女”教师和“女”同学的name、sex和birthday.
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select Tname,Tsex,Tbirthday from Teacher where Tsex=\'女\' union select Sname,Ssex,Sbirthday from Student where Ssex=\'女\'
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33、 查询成绩比该课程平均成绩低的同学的成绩表。
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select * from score a where degree < (select avg(degree) from score b where b.cno=a.cno)
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34、 查询所有任课教师的Tname和Depart.
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select Tname,Depart from Teacher where tno in (select tno from course )
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35 、 查询所有未讲课的教师的Tname和Depart.
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select Tname,Depart from Teacher where Tno not in (select Tno from Course where cno in (select cno from score ))
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36、查询至少有2名男生的班号。
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select class from student where ssex=\'男\' group by class having count(*)>1
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37、查询Student表中不姓“王”的同学记录。
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select * from Student where Sname not like \'王%%\'
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38、查询Student表中每个学生的姓名和年龄。
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select Sname, year(now())-year(sbirthday) from Student
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39、查询Student表中最大和最小的Sbirthday日期值。
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select Max(Sbirthday ),Min(Sbirthday ) from Student
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40、以班号和年龄从大到小的顺序查询Student表中的全部记录。
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select * from Student order by class desc, Sbirthday
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41、查询“男”教师及其所上的课程。
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select Tname,Cname from course,teacher where course.tno= teacher.tno and teacher.Tsex=\'男\'
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42、查询最高分同学的Sno、Cno和Degree列。
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select Sno,Cno,Degree from score where degree=(select max(degree) from score)
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排序写法：
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select Sno,Cno,Degree from score order by degree desc limit 0,1
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43、查询和“李军”同性别的所有同学的Sname.
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select Sname from Student where Ssex = (select Ssex from Student where Sname=\'李军\')
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44、查询和“李军”同性别并同班的同学Sname.
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select Sname from Student where Ssex = (select Ssex from Student where Sname=\'李军\' ) and class=( select class from student where Sname=\'李军\')
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45、查询所有选修“计算机导论”课程的“男”同学的成绩表。
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select Sno,Cno,degree 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\')
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