一、创建序列

create sequence SEQ_USER_ID
minvalue 1
maxvalue 99999999999
start with 1
increment by 1;

二、创建数据库表

create table MS_USER(
  user_id number(11) not null primary key,mobile_phone varchar2(16) not null,user_name varchar2(32) not null
);

-- 增加数据库表备注和表字段的备注信息
comment on table MS_USER is '用户信息表';
comment on column MS_USER.user_id is '用户ID';
comment on column MS_USER.mobile_phone is '手机号码';
comment on column MS_USER.user_name is '用户名称';

三、创建触发器

create or replace trigger MS_USER_TRIGGER       
before insert on MS_USER       
for each row       
begin       
select SEQ_USER_ID.nextval into :new.user_id from dual;      
end ;  
/

四、测试

插入记录：

insert into MS_USER(mobile_phone,user_name) values('12345678901','Kevin');

查询记录：

select * from ms_user;