我想最初学习数据库时都是以student表、course表和sc表为例的吧

首先创建这三张表：必要时可重新创建用户及密码并登陆

环境：oracle 10g

declare

vcnt number;

begin

select count(*) into vcnt from user_tables where table_name='SC';

If vcnt = 1 Then

Execute immediate 'drop table sc';

end if;

select count(*) into vcnt from user_tables where table_name='STUDENT';

If vcnt = 1 Then

Execute immediate 'drop table student';

end if;

select count(*) into vcnt from user_tables where table_name='COURSE';

If vcnt = 1 Then

Execute immediate 'drop table course';

end if;

end;

/

--创建表

Create table student

(sno char(10) primary key,

sname varchar(20) not null,

sage smallint,

ssex char(2),

sdept varchar(20));

Create table course

(cno char(10) primary key,

cname varchar(20) not null,

credit smallint);

Create table sc

(sno char(10),

cno char(10),

grade smallint,

primary key(sno,cno));

--向表中插入数据

insert into student values('001','葛灵','19','f','MA');

insert into student values('002','岳林月','25','f','MA');

insert into student values('003','姬胜俊','16','f','CS');

insert into student values('004','马源','20','f','MA');

insert into student values('005','翁印','23','m','C');

insert into course values('C01','C语言','4');

insert into course values('C02','数学','4');

insert into course values('C03','英语','2');

insert into course values('C04','计算机','5');

insert into course values('C05','数字电路','3');

insert into course values('C06','数据库','2');

--001号学生选修课程

insert into sc values('001','C05','75');

insert into sc values('001','C01','68');

insert into sc values('001','C03','86');

insert into sc values('001','C02','40');

insert into sc values('001','C04','97');

--002号学生选修课程

insert into sc values('002','C01','60');

insert into sc values('002','C02','67');

insert into sc values('002','C03','47');

insert into sc values('002','C04','98');

--003号学生选修课程

insert into sc values('003','C05','82');

insert into sc values('003','C01','54');

insert into sc values('003','C02','84');

insert into sc values('003','C03','54');

insert into sc values('003','C04','76');

--004号学生选修课程

insert into sc values('004','C02','87');

insert into sc values('004','C03','69');

insert into sc values('004','C01','40');

--005号学生选修课程

insert into sc values('005','C03','41');

insert into sc values('005','C05','62');

insert into sc values('005','C01','98');

commit;

若每次都需要创建这三张表，可以新建txt文件，如a.txt，将上述内容复制到该文件中，并将文件放置在d盘。

在command窗口，执行 @d：/a.txt ; 或者 start d：/a.txt ;