/*建學生表*/
create table pm_stu(
stu_id varchar2(20) not null,
stu_name varchar2(20)
);
insert into pm_stu(stu_id,stu_name) values('1','張三');
insert into pm_stu(stu_id,stu_name) values('2','李四');
insert into pm_stu(stu_id,stu_name) values('3','王五');
insert into pm_stu(stu_id,stu_name) values('4','趙六');
