给oracle写自增序列

1.新建表结构

<span style="font-size:32px;">create table tb_user (
userId             INTEGER                         not null,
userName           CHAR(20),
constraint PK_TB_USER primary key (userId)
)</span>

2.新建自增序列

<span style="font-size:32px;">create sequence tb_user_id
increment by 1
start with 0
maxvalue 10000
minvalue 0
nocycle
cache 20
order;</span>

3.插入数据

<span style="font-size:32px;">insert into tb_user(userId,userName) values(tb_user_id.nextval,'刘云生')</span>