classer à deux dates - chaque date itérativement

Question

Comment faire une requête pour le classement sur «valeur» pour chaque jour dans le tableau ci-dessous? Ex: IT devrait lister le 'mydate', 'value', 'rank' pour toutes les valeurs sur 20 et ensuite faire un nouveau rang() pour toutes les valeurs sur 21ème? Merci ...

create table tv (mydate,value) 
as 
select to_date('20/03/2010 00','dd/mm/yyyy HH24'),98 from dual union all 
select to_date('20/03/2010 01','dd/mm/yyyy HH24'),124 from dual union all 
select to_date('20/03/2010 02','dd/mm/yyyy HH24'),140 from dual union all 
select to_date('20/03/2010 03','dd/mm/yyyy HH24'),138 from dual union all 
select to_date('20/03/2010 04','dd/mm/yyyy HH24'),416 from dual union all 
select to_date('20/03/2010 05','dd/mm/yyyy HH24'),196 from dual union all 
select to_date('20/03/2010 06','dd/mm/yyyy HH24'),246 from dual union all 
select to_date('20/03/2010 07','dd/mm/yyyy HH24'),176 from dual union all 
select to_date('20/03/2010 08','dd/mm/yyyy HH24'),124 from dual union all 
select to_date('20/03/2010 09','dd/mm/yyyy HH24'),128 from dual union all 
select to_date('20/03/2010 10','dd/mm/yyyy HH24'),32010 from dual union all 
select to_date('20/03/2010 11','dd/mm/yyyy HH24'),384 from dual union all 
select to_date('20/03/2010 12','dd/mm/yyyy HH24'),368 from dual union all 
select to_date('20/03/2010 13','dd/mm/yyyy HH24'),392 from dual union all 
select to_date('20/03/2010 14','dd/mm/yyyy HH24'),374 from dual union all 
select to_date('20/03/2010 15','dd/mm/yyyy HH24'),350 from dual union all 
select to_date('20/03/2010 16','dd/mm/yyyy HH24'),248 from dual union all 
select to_date('20/03/2010 17','dd/mm/yyyy HH24'),396 from dual union all 
select to_date('20/03/2010 18','dd/mm/yyyy HH24'),388 from dual union all 
select to_date('20/03/2010 19','dd/mm/yyyy HH24'),360 from dual union all 
select to_date('20/03/2010 20','dd/mm/yyyy HH24'),194 from dual union all 
select to_date('20/03/2010 21','dd/mm/yyyy HH24'),234 from dual union all 
select to_date('20/03/2010 22','dd/mm/yyyy HH24'),328 from dual union all 
select to_date('20/03/2010 23','dd/mm/yyyy HH24'),216 from dual union all 
select to_date('21/03/2010 00','dd/mm/yyyy HH24'),224 from dual union all 
select to_date('21/03/2010 01','dd/mm/yyyy HH24'),292 from dual union all 
select to_date('21/03/2010 02','dd/mm/yyyy HH24'),264 from dual union all 
select to_date('21/03/2010 03','dd/mm/yyyy HH24'),132 from dual union all 
select to_date('21/03/2010 04','dd/mm/yyyy HH24'),142 from dual union all 
select to_date('21/03/2010 05','dd/mm/yyyy HH24'),328 from dual union all 
select to_date('21/03/2010 06','dd/mm/yyyy HH24'),184 from dual union all 
select to_date('21/03/2010 07','dd/mm/yyyy HH24'),240 from dual union all 
select to_date('21/03/2010 08','dd/mm/yyyy HH24'),224 from dual union all 
select to_date('21/03/2010 09','dd/mm/yyyy HH24'),496 from dual union all 
select to_date('21/03/2010 10','dd/mm/yyyy HH24'),370 from dual union all 
select to_date('21/03/2010 11','dd/mm/yyyy HH24'),352 from dual union all 
select to_date('21/03/2010 12','dd/mm/yyyy HH24'),438 from dual union all 
select to_date('21/03/2010 13','dd/mm/yyyy HH24'),446 from dual union all 
select to_date('21/03/2010 14','dd/mm/yyyy HH24'),426 from dual union all 
select to_date('21/03/2010 15','dd/mm/yyyy HH24'),546 from dual union all 
select to_date('21/03/2010 16','dd/mm/yyyy HH24'),546 from dual union all 
select to_date('21/03/2010 17','dd/mm/yyyy HH24'),684 from dual union all 
select to_date('21/03/2010 18','dd/mm/yyyy HH24'),568 from dual union all 
select to_date('21/03/2010 19','dd/mm/yyyy HH24'),504 from dual union all 
select to_date('21/03/2010 20','dd/mm/yyyy HH24'),392 from dual union all 
select to_date('21/03/2010 21','dd/mm/yyyy HH24'),256 from dual union all 
select to_date('21/03/2010 22','dd/mm/yyyy HH24'),236 from dual union all 
select to_date('21/03/2010 23','dd/mm/yyyy HH24'),168 from dual 

Answer 1

Voulez commandé par le temps:

SELECT mydate 
     , value 
     , rank() over (partition by trunc(mydate) order by mydate) 
FROM tv; 

Vous voulez classées par ordre décroissant:

SELECT mydate 
     , value 
     , rank() over (partition by trunc(mydate) order by value) 
FROM tv;