数据库系统概论(第五版)79页提供的三个表,为了我们上机操作容易,下面创建这三个表

学生-课程数据库中包含以下三个表

  • 学生表:Student(Sno,Sname,Ssex,Sage,Sdept)
  • 课程表:Course(Cno,Cname,Cpno,Ccredit)
  • 学生选课表:SC(Sno,Cno,Grade)

关系的主码加粗表示,各个表中的数据实例:

Student

学号(Sno)姓名(Sname)性别(Ssex)年龄(Sage)所在系 (Sdept)
201215121李勇20CS
201215122刘晨19CS
201215123王敏18MA
201215125张立19IS

Course

课程号(Cno)课程名(Cname)先行课(Cpno)学分(Ccredit)
1数据库54
2数学2
3信息系统14
4操作系统63
5数据结构74
6数据处理2
7PASCAL语言64

SC

学号(Sno)课程号(Cno)成绩(Grade)
201215121192
201215121285
201215121388
201215122290
201215122380
1、建表语句

Sno为Student表的主键,Cno为Course表的主键,SC表中外键Sno,Cno分别是Student表和Course表的主键

create table Student (Sno char(9) primary key,Sname char(20),Ssex char(2),Sage int,Sdept char(10))charset=utf8;create table Course (Cno char(2) primary key,Cname char(20),Cpno char(2),Ccredit integer)charset=utf8;create table SC (Sno char(9),Cno char(2),Grade float,foreign key(Sno) references Student(Sno),foreign key(Cno) references Course(Cno))charset=utf8;
2、插入数据
insert into Student values('201215121','李勇','男',20,'CS');insert into Student values('201215122','刘晨','女',19,'CS');insert into Student values('201215123','王敏','女',18,'MA');insert into Student values('201215125','张立','男',19,'IS');insert into Course values('1','数据库','5',4);insert into Course values('2','数学','',2);insert into Course values('3','信息系统','1',4);insert into Course values('4','操作系统','6',3);insert into Course values('5','数据结构','7',4);insert into Course values('6','数据处理','',2);insert into Course values('7','PASCAL语言','6',4);insert into SC values('201215121','1',92);insert into SC values('201215121','2',85);insert into SC values('201215121','3',88);insert into SC values('201215122','2',90);insert into SC values('201215122','3',80);

3、查询表

select * from Student;select * from Course;select * from SC;