Sum of weekly data

Question

sum of weekly data.. from daily data.
create table test3(tno number(10), tdate date);
declare
begin
for i in 1..20 loop
insert into test3 values(i,sysdate+i);
end loop;
end;
SELECT * FROM test3;
TNO                    TDATE                    
1                      21-APR-11                
2                      22-APR-11                
3                      23-APR-11                
4                      24-APR-11                
5                      25-APR-11                
6                      26-APR-11                
7                      27-APR-11                
8                      28-APR-11                
9                      29-APR-11                
10                     30-APR-11                
11                     01-MAY-11                
12                     02-MAY-11                
13                     03-MAY-11                
14                     04-MAY-11                
15                     05-MAY-11                
16                     06-MAY-11                
17                     07-MAY-11                
18                     08-MAY-11                
19                     09-MAY-11                
20                     10-MAY-11                
20 rows selected
now i want sum of weekly datasum(tTNO).

Answer 1

Something like...
SQL> ed
Wrote file afiedt.buf
  1  with t as (select rownum as tno, sysdate+rownum as tdate from dual connect by rownum <= 20)
  2  --
  3  -- end of test data
  4  --
  5  select distinct trunc(tdate,'fmIW') as start_wk
  6        ,trunc(tdate,'fmIW')+6 as end_wk
  7        ,sum(tno) over (partition by trunc(tdate,'fmIW')) as sm
  8  from t
  9* order by 1
SQL> /
START_WK    END_WK              SM
18-APR-2011 24-APR-2011         10
25-APR-2011 01-MAY-2011         56
02-MAY-2011 08-MAY-2011        105
09-MAY-2011 15-MAY-2011         39or just a basic SUM rather than analytical...
SQL> ed
Wrote file afiedt.buf
  1  with t as (select rownum as tno, sysdate+rownum as tdate from dual connect by rownum <= 20)
  2  --
  3  -- end of test data
  4  --
  5  select trunc(tdate,'fmIW') as start_wk
  6        ,trunc(tdate,'fmIW')+6 as end_wk
  7        ,sum(tno) as sm
  8  from t
  9  group by trunc(tdate,'fmIW')
10* order by 1
SQL> /
START_WK    END_WK              SM
18-APR-2011 24-APR-2011         10
25-APR-2011 01-MAY-2011         56
02-MAY-2011 08-MAY-2011        105
09-MAY-2011 15-MAY-2011         39Edited by: BluShadow on 20-Apr-2011 13:56