Oracle create auto increment ID

1. Create a sequence

create sequence seq_hyqf_warn_dumping minvalue 1 maxvalue 999999999999999999 start with 1 increment by 1 nocache

2. Create a trigger

create or replace trigger seq_hyqf_warn_dumping 
before insert on HYQF_WARN_DUMPING
for each row
begin
select seq_hyqf_warn_dumping.nextval into :new.OBJECTID from dual;
end;

3. Delete sequence

DROP SEQUENCE seq_hyqf_warn_dumping;