序列:sequence,產生一個獨一無二的序列,是oracle特有的。
create table article
(
id number,
title varchar2(1024),
cont long
);
insert into article values(seq.nextval,'a','b');
select * from user_sequences; --查詢序列
create sequence seq; --創建序列seq對象
select seq.nextval from dual;
drop sequence seq;