建学生表
Create table student
(snochar(9) primary key,
Snamechar(20) unique,
Ssex char(2),
Sage smallint,
Sdept char(20)
);
Create table course
(cnochar(4) primary key,
Cnamechar(40) no null,
Cpnochar(4),
Ccreditsmallint,
Foreignkey (cpno) references course(cno)
);
Create table sc
(snochar(9),
Cnochar(4),
Gradesmallint,
Primarykey(sno, cno),
Foreignkey(sno) references student(sno),
Foreignkey(cno) references course(cno)
);
Insert
Into student(sno,sname,ssex,sage,sdept)
Values('201215121','李勇','男',20,'CS')；
INSERT
INTO Student (Sno,Sname,Ssex,Sage,Sdept)
VALUES ('201215122','刘晨','女',19,'CS');
INSERT
INTO Student (Sno,Sname,Ssex,Sage,Sdept)
VALUES ('201215123','王敏','女',18,'MA');
INSERT
INTO Student (Sno,Sname,Ssex,Sage,Sdept)
VALUES ('201215125','张立','男',19,'IS');
Insert
Into course(cno,cname,cpno,ccredit)
Values(‘2’,’数学’,’null’,’2’);
Insert
Into course(cno,cname,cpno,ccredit)
Values(‘6’,’数据处理’,’null’,’2’);
Insert
Into course(cno,cname,cpno,ccredit)
Values(‘4’,’操作系统’,’6’,’3’);
insert
into course (cno,cname,cpno,ccredit)
values('7','PSCAL语言','6','4');
insert
into course (cno,cname,cpno,ccredit)
values('5','数据结构','7','4');
insert
into course (cno,cname,cpno,ccredit)
values('1','数据库','5','4');
insert
into course (cno,cname,cpno,ccredit)
values('3','信息系统','1','4');
insert
into sc(sno,cno,grade)
values(‘200215121’,’1’,’92’);
insert
into sc (sno,cno,grade)
values('200215121','2','85');
insert
into sc (sno,cno,grade)
values('200215121','3','88');
insert
into sc (sno,cno,grade)
values('200215122','2','90');
insert
into sc (sno,cno,grade)
values('200215122','3','80');