begin
  for i in 
    (select to_date('29.03.2017', 'dd.mm.yyyy') dat from dual
     union all
     select to_date('30.03.2017', 'dd.mm.yyyy') dat from dual) loop

    Merge..using..T.;
    commit;
  end loop;
end;

alter system flush shared_pool;
alter system flush buffer_cache;

   select to_date('30.03.2017', 'dd.mm.yyyy') dat from dual
     union all
     select to_date('29.03.2017', 'dd.mm.yyyy') dat from dual

Execute Immediate 'Merge..'

alter system flush shared_pool;
alter system flush buffer_cache;

      MERGE INTO ABC a
              USING (select t1.key0, t1.f0, t2.vv0 v0, t2.vv1 v1
                     from ABC  t1
                     inner join ABC  t2 on t1.key0 = t2.key0 and t1.f0<>t2.f0
                     where t1.dat = i.dat
                       and t2.dat = i.dat
                       and ((t2.vv0 is not null) or (t2.vv1 is not null))
                       and (t1.v0 is null) and (t1.v1 is null)
                    ) tmp
                 ON (
                     a.DAT = i.dat
                     AND a.key0 = tmp.key0
                     AND a.f0 = tmp.f0
                     )
         WHEN MATCHED
         THEN
            UPDATE SET
               a.v0 = tmp.v0,
               a.v1 = tmp.v1;