Oracle query - Exclude record

Question

Hi
I have the following data example
Fields are >> UniqueID: Date: Account No
Corresponding data row1>> 0001: 21/02/2008: 1000
Corresponding data row2>> 0002: 21/02/2008: 4001
Corresponding data row3>> 0003: 22/02/2008: 1000
Fields are >> UniqueID: Date: Account No
Corresponding data row1>> 0097: 28/02/2008: 1000
Corresponding data row2>> 0098: 29/02/2008: 4001
Corresponding data row3>> 0003: 29/02/2008: 4001
The first set is week 1 and the second week 2
If Account No occurs more than once in a week, I need to show this as if it occurred once for each week. Any advice
Thanks in advance

Answer 1

Do you mean like this?
SQL> ed
Wrote file afiedt.buf
  1  with t as (select '0001' as uniqueid, to_date('21/02/2008','DD/MM/YYYY') as dt, 1000 as account_no from dual union all
  2             select '0002', to_date('21/02/2008','DD/MM/YYYY'), 4001 from dual union all
  3             select '0003', to_date('22/02/2008','DD/MM/YYYY'), 1000 from dual union all
  4             select '0097', to_date('28/02/2008','DD/MM/YYYY'), 1000 from dual union all
  5             select '0098', to_date('29/02/2008','DD/MM/YYYY'), 4001 from dual union all
  6             select '0003', to_date('29/02/2008','DD/MM/YYYY'), 4001 from dual)
  7  select uniqueid, dt, account_no
  8  from (
  9    select uniqueid, dt, account_no, row_number() over (partition by to_char(dt,'IW'), account_no order by dt) as rn
10    from t
11    )
12* where rn = 1
SQL> /
UNIQ DT        ACCOUNT_NO
0001 21-FEB-08       1000
0002 21-FEB-08       4001
0097 28-FEB-08       1000
0098 29-FEB-08       4001
SQL>This assumes that the earliest entry for a particular account in the week is required. If you needed e.g. the maximum uniqueid you would change the order by to "order by uniqueid desc" in the analytical function.