1 --student表
 2 create table student(
 3 　　stu_id varchar2(10) primary key,
 4 　　stu_name varchar2(10) not null,
 5 　　stu_sex varchar2(2) not null,
 6 　　stu_birthday date,
 7 　　class_id number
 8 );
 9 --新增表註釋
10 comment on table student is '學生資訊表';
11 --欄位添加註釋
12 comment on column student.stu_id is '
 
學號(主鍵)';
13 comment on column student.stu_name is '學生姓名';
14 comment on column student.stu_sex is '學生性別';
15 comment on column student.stu_birthday is '學生出生年月';
16 comment on column student.class_id is '學生所在班級';
17 
18 --sclass表
19 create table sclass(
20 　　class_id number primary key,
21 　　class_name varchar2
 
(10) not null
22 );
23 comment on table sclass is '班級資訊表';
24 comment on column sclass.class_id is '班級編號';
25 comment on column sclass.class_name is '班級名稱'; 
26 
27 --新增外來鍵
28 alter table student add constraint fk_class_id foreign key(class_id) references sclass(class_id);
29 
30 --新增資料
31 insert into
 
 sclass(class_id, class_name)values(1,'計應1401');
32 insert into sclass(class_id, class_name)values(2,'計網1401');
33 insert into sclass(class_id, class_name)values(3,'軟體1401');
34 insert into student(stu_id, stu_name, stu_sex, stu_birthday, class_id)values('A001','張珊','女',to_date('1995-10-02','yyyy-mm-dd'),1) ;
35 insert into student(stu_id, stu_name, stu_sex, stu_birthday, class_id)values('A002','李思','女',to_date('1995-10-02','yyyy-mm-dd'),1) ;
36 insert into student(stu_id, stu_name, stu_sex, stu_birthday, class_id)values('A003','王武','女',to_date('1996-10-02','yyyy-mm-dd'),2) ;
37 insert into student(stu_id, stu_name, stu_sex, stu_birthday, class_id)values('A004','趙柳','女',to_date('1996-12-02','yyyy-mm-dd'),3) ;
38 insert into student(stu_id, stu_name, stu_sex, stu_birthday, class_id)values('A005','趙柳','女',sysdate,3) ;