How to get result set

Question

Hi all,
Please tell me how to get the below required out put.
this is my table and data
with t as (select 11 plcy,1 nm from dual union all
select 11 plcy,2 nm from dual union all
select 11 plcy,3 nm from dual union all
select 11 plcy,5 nm from dual union all
select 22 plcy,1 nm from dual union all
select 22 plcy,2 nm from dual union all
select 22 plcy,3 nm from dual union all
select 33 plcy,1 nm from dual union all
select 44 plcy,2 nm from dual union all
select 55 plcy,4 nm from dual union all
select 66 plcy,3 nm from dual )
select * from t
this my required output.
from above query required output is below
plcy      nm
11      5
33      1
44      2
55      4
66      3
if pass nm = 5 then 11
if i pass nm= 1 then 33
if i pass nm=2 then 44
if pass nm = 4 then 55
if i pass nm =3 thne 66
it means it has only one value from plcy
11 5
33 1
44 2
55 4
66 3
thanks,

Answer 1

Something like this:
SQL > with t as (select 11 plcy,1 nm from dual union all
  2             select 11 plcy,2 nm from dual union all
  3             select 11 plcy,3 nm from dual union all
  4             select 11 plcy,5 nm from dual union all
  5             select 22 plcy,1 nm from dual union all
  6             select 22 plcy,2 nm from dual union all
  7             select 22 plcy,3 nm from dual union all
  8             select 33 plcy,1 nm from dual union all
  9             select 44 plcy,2 nm from dual union all
10             select 55 plcy,4 nm from dual union all
11             select 66 plcy,3 nm from dual
12  )
13  SELECT     MAX(plcy) plcy
14  ,  NM
15  FROM       t
16  GROUP BY NM
17  ORDER BY PLCY
18  /
      PLCY         NM
        11          5
        33          1
        44          2
        55          4
        66          3