How to sum colmn for evey day in the month

Question

All if i have a table that has
username, volume, date
And i want to sum the volume for everyday of the month, does anyone have an example.

Answer 1

hehe, losing my head by using analytics when they're not needed... ooops!
SQL> with t as (select 'USERA' as username, to_date('01/01/2007','DD/MM/YYYY') as dt, 1 as vol FROM DUAL UNION ALL
  2             select 'USERA', to_date('01/01/2007','DD/MM/YYYY'), 2 FROM DUAL UNION ALL
  3             select 'USERB', to_date('01/01/2007','DD/MM/YYYY'), 4 FROM DUAL UNION ALL
  4             select 'USERB', to_date('01/01/2007','DD/MM/YYYY'), 8 FROM DUAL UNION ALL
  5             select 'USERC', to_date('03/01/2007','DD/MM/YYYY'), 16 FROM DUAL UNION ALL
  6             select 'USERD', to_date('01/01/2007','DD/MM/YYYY'), 32 FROM DUAL UNION ALL
  7             select 'USERA', to_date('02/01/2007','DD/MM/YYYY'), 64 FROM DUAL UNION ALL
  8             select 'USERB', to_date('01/01/2007','DD/MM/YYYY'), 128 FROM DUAL UNION ALL
  9             select 'USERC', to_date('03/01/2007','DD/MM/YYYY'), 256 FROM DUAL UNION ALL
10             select 'USERA', to_date('02/01/2007','DD/MM/YYYY'), 512 FROM DUAL UNION ALL
11             select 'USERD', to_date('01/01/2007','DD/MM/YYYY'), 127 FROM DUAL UNION ALL
12             select 'USERA', to_date('03/01/2007','DD/MM/YYYY'), 31 FROM DUAL)
13  -- END OF TEST DATA
14  select username, dt, sum(vol)
15  from t
16  group by username, dt
17  order by 1,2
18  /
USERN DT                    SUM(VOL)
USERA 01/01/2007 00:00:00          3
USERA 02/01/2007 00:00:00        576
USERA 03/01/2007 00:00:00         31
USERB 01/01/2007 00:00:00        140
USERC 03/01/2007 00:00:00        272
USERD 01/01/2007 00:00:00        159
6 rows selected.