Write an select command 4 the pblm

Question

hi frnz kindly help me to solve the pblm given below...
the table contains:
uid billno amount
1 101 100
2 102 200
3 103 300
the o/p shuld be:
uid billno amount total
1 101 100
2 102 200 *300*
3 103 300 *600*
kindly solve this without using the order command....... plz............

Answer 1

Another way but same.
  1  with t as (
  2      select 1 id, 101 billno, 100  amount from dual union all
  3      select 2, 102, 200  from dual union all
  4      select 3, 103, 300 from dual
  5      )
  6      select id
  7      ,      billno
  8      ,      amount
  9      ,      to_number(decode(sum(amount) over (order by billno,amount ),amount, null,
10            sum(amount) over (order by billno,amount ) ) )Cumm_amount
11*  from t
SQL> /
        ID     BILLNO     AMOUNT CUMM_AMOUNT
         1        101        100 (null)
         2        102        200         300
         3        103        300         600Using NULLIF
SQL>with t as (
  2      select 1 id, 101 billno, 100  amount from dual union all
  3      select 2, 102, 200  from dual union all
  4      select 3, 103, 300 from dual
  5      )
  6      select id
  7      ,      billno
  8      ,      amount
  9      ,     NULLIF(sum(amount) over (order by billno,amount ),amount) Cumm_amount
10*  from t
11  /
        ID     BILLNO     AMOUNT CUMM_AMOUNT
         1        101        100 (null)
         2        102        200         300
         3        103        300         600Ss