oracle開窗函數：先分組，再按時間排序取第一條

select  t.*  
   from (select a.*, row_number() over(partition by 需要分組的字段 order by 更新時間 desc) rw  
           from 表 a) t  
  where t.rw = 1  

實例：

select  t.*  
   from (select a.orgid,a.createdate, row_number() over(partition by orgid order by createdate desc) rw  
           from sec_per_complainlist a where a.yearmonth = '2018-01'
           and a.status in ('4', '5', '6', '7') /**狀態為最終**/) t  
  where t.rw = 1