Getting max date and max time column plz help

hi
i have a table with suppose 7 columns with date and time column seperate
i want to design a query which retrieve the current or the maxmum date with the max of time in that date.
columns a ,b,c, date, time
22-05-07 20
23-05-07 50
24-05-07 40
25-05-07 30
22-05-07 20
ans " suppose current date is 25 "
a,b,c,25-05-07,40

try like this..
SQL> with rt as
2 (select 1 col1,'22-05-07' dt, 20 tm from dual union all
3 select 2,'23-05-07', 50 from dual union all
4 select 3,'24-05-07', 40 from dual union all
5 select 4,'25-05-07', 30 from dual union all
6 select 5,'25-05-07', 45 from dual union all
7 select 6,'22-05-07', 20 from dual)
8 select col1,dt,tm from
9 (select col1,
10      dt,
11      max(tm) over(partition by to_date(dt,'DD-MM-RR') order by col1 desc) tm,
12      row_number() over(partition by to_date(dt,'DD-MM-RR') order by col1 desc) rn
13 from rt where to_date(dt,'DD-MM-RR') in (select max(to_date(dt,'DD-MM-RR')) dt from rt))
14 where rn = 1;
      COL1 DT               TM
         5 25-05-07         45
SQL>

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