create sequence t_user_seq;
insert into t_user (uno) values(t_user_seq.nextval);
select * from t_user;
insert into t_user values(t_user_seq.nextval,'dd','ddd');
delete from t_user;
commit;
create sequence t_user_seq;
insert into t_user (uno) values(t_user_seq.nextval);
select * from t_user;
insert into t_user values(t_user_seq.nextval,'dd','ddd');
delete from t_user;
commit;