Select multiple columns from tab with group by

hi
i have a table with many columns suppose in that i have 2 columns as date and time
and in my table i am getting suppose data like
columns -> date time a b c
22-may-2207 10
22-may-2207 17
23-may-2007 5
24-may-2007 12
24-may-2007 15
i want to select all columns with data with unique data with max of time for that particular date
answer :-
22-may-2007 17 a b c
23-may-2007 5 a b c
24-may-2007 15 a b c
with all other cloumns also with this
plz help me i am trying too much and not able to solve this.

try this
select datecol, timecol, a, b, c
from (
select datecol, timecol, a, b, c,
rank() over(partition by datecol order by timecol desc) rn
from my_table
where rn = 1
order by datecol;Message was edited by:
Jens Petersen

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