update pmu_KUKU D
  set (t, r) = 
   ( select dtt, rnn from (
    select rwd,dtt , rownum rnn from (
     select max(rowid) rwd, nvl(max(t),sysdate) + 1 dtt from pmu_kuku where pmu_kuku.w in (1,3) group by w
    )
   ) S
   where S.rwd = D.rowid)
where 
  D.rowid in (select rwd from (
    select rwd,dtt , rownum rnn from (
     select max(rowid) rwd, nvl(max(t),sysdate) + 1 dtt from pmu_kuku where pmu_kuku.w in (1,3) group by w
    )
   ) S )  

merge into pmu_KUKU D
 using ( 
   select rwd,dtt , rownum rnn from (
     select max(rowid) rwd, nvl(max(t),sysdate) + 1 dtt from pmu_kuku where pmu_kuku.w in (1,3) group by w
   )
 ) S
 on (D.rowid = S.rwd)
when matched then update set D.T = S.dtt, D.r = S.rnn