Total after every 25 records

Question

Dear Friiends,
I would like to write down query which also returns the total of some columns after every 25 records.
like this
ccno salary
1 5000
2 10000
25 80000
total       <total of above 25>
26 25000
27 10000
50 13000
total       <total of above 50>
can we achieve this
Waiting for reply .

Answer 1

with tab as (
select 1 ccno,100 salary from dual union all
select 2 ccno,200 salary from dual union all
select 3 ccno,300 salary from dual union all
select 4 ccno,400 salary from dual union all
select 5 ccno,500 salary from dual union all
select 6 ccno,600 salary from dual union all
select 7 ccno,700 salary from dual
)--end of test data
select ccno,
       salary,
       case when mod(row_number() over (order by ccno), 3) = 0 then sum(salary) over (order by ccno) else null end as sumsal
from tab
CCNO                   SALARY                 SUMSAL                
1                      100                                          
2                      200                                          
3                      300                    600                   
4                      400                                          
5                      500                                          
6                      600                    2100                  
7                      700                                          
7 rows selectedChange the 3 in the mod to 25 for your data