oracle关联表查询记录表最新一条记录

SELECT *         
  FROM 表1 t1
  JOIN (SELECT *,
               ROW_NUMBER() OVER(PARTITION BY 单据ID ORDER BY 处理时间 DESC) rn
         FROM 表2
       ) t2
    ON t1.单据ID = t2.单据ID
   AND t2.rn = 1