oracle 分页语句

select *
  from (select a.*, rownum r
          from (select * from lg_order o order by o.order_id) a
         where rownum <= 20) b
where r >= 10

select *
  from (select rid
          from (select rownum rn, rid
                  from (select rowid rid from lg_order o order by o.order_id)
                 where rownum <= 20)
         where rn >= 10) t1,
       lg_order t2
where t2.rowid = t1.rid