[MySQL光速入门]008 SQL强化练习

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）。表结构及数据如下，请完成题目。

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:

#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
(
id int(11) not null primary key,
sno varchar(20) not null,
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(1,'103','3-245','86');
insert into score values(2,'105','3-245','75');
insert into score values(3,'109','3-245','68');
insert into score values(4,'103','3-105','92');
insert into score values(5,'105','3-105','88');
insert into score values(6,'109','3-105','76');
insert into score values(7,'103','3-105','64');
insert into score values(8,'105','3-105','91');
insert into score values(9,'109','3-105','78');
insert into score values(10,'103','6-166','85');
insert into score values(11,'105','6-166','79');
insert into score values(12,'109','6-166','81');
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