1.先创建好一张表
2.创建好序列
create sequence seq_t_dept
minvalue 60
maxvalue 99999999
start with 60
increment by 1
cache 50
3.再创建一个触发器
create or replace trigger DEPT_TRIGAA(大写)
before insert on T_PERSON_DESC(表名) for each row
begin
select SEQ_T_DEPT.nextval into :new.PK_ID from dual;
end;