Problem in Update using last value of a duplicate row

Question

Hi,
I have 2 values in a table TEST
10 ABC
10 DEF
I want to get the last value i.e 10 DEF
I want the last value i.e 10 DEF to update in the table TEST1 which has value 10 XYZ.I want to update with 10 DEF
I have tried using :
with t
as
select 10 no, 'ABC' val from dual
union all
select 10 no, 'DEF' val from dual
select no, val
from (
select no, val, row_number() over(order by val) rno, count(*) over() cnt
from t)
where rno = cnt
But i got the last row of the duplicate values but how to update the last value into TEST1
Any help will be needful for me.

Answer 1

Just update it
update test1 t
   set val = (select val
                from (select no, val, row_number() over(order by val) rno, count(*) over() cnt
                        from test) t1
               where rno = cnt
                 and t.no = t1.no)
where exists(select null
                from (select no, val, row_number() over(order by val) rno, count(*) over() cnt
                        from test) t1
               where rno = cnt
                 and t.no = t1.no)