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李勇男20CS201215122刘晨女19CS201215123王敏女18MA201215125张立男19IS
Course
课程号(Cno)课程名(Cname)先行课(Cpno)学分(Ccredit)1数据库542数学23信息系统144操作系统635数据结构746数据处理27PASCAL语言64
SC
学号(Sno)课程号(Cno)成绩(Grade)201215121192201215121285201215121388201215122290201215122380
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;
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