Sql 从具有相同id的表中选择最大状态

我有一张桌子

PartNo| Revision Status
501.   1.       Current
501.   2.       Internal
502.   1.       Internal
502.   2.       Trail

要从中检索吗

1. PartNo 501 having status is current 
2. Part 502 having status is Trail

基于状态首选项，我需要根据状态序列获取零件号

1. Current
2. Trail

。在Oracle SQL中，一个选项如下（第1-6行中的示例数据；查询从第7行开始）：

SQL> with test (partno, revision, status) as
  2    (select 501, 1, 'current'  from dual union all
  3     select 501, 2, 'internal' from dual union all
  4     select 502, 1, 'internal' from dual union all
  5     select 502, 2, 'trail'    from dual
  6    )
  7  select partno, revision, status
  8  from (select partno, revision, status,
  9          row_number() over (partition by partno order by revision desc) rn
 10        from test
 11       )
 12  where rn = 1;

    PARTNO   REVISION STATUS
---------- ---------- --------
       501          2 internal
       502          2 trail

SQL>