Want to get sum/avg first 90% records in each grouped record set.

Question

Hi Gurus,
Need your help or example query which help me to achieve sum/avg first 90% records in each grouped record set. Let me show you the basic query and output and proposed output.
select Pid, Sum(SalesAmt) TotalSaleAmt, Avg(SalesAmt) AvgSaleAmt, count(*) NoOfSales from ProductSales group by Pid;
PID TotalSaleAmt AvgSaleAmt NoOfSales
1 12000 100 120
2 24000 50 480
Now I need for PID =1 TotalSaleAmt of first 90% of NoOfSale i.e.120(this is basically nuber of rows found in PrdocutSales Table).
I hope I am clear enough explain my requirement... I would appreciate if we have some Analytical function available..
Gurus Pls help me asap..
Thanks In adavance...
Srichan.

Answer 1

Now I need for PID =1 TotalSaleAmt of first 90% of NoOfSale i.e.120(this is basically nuber of rows found in PrdocutSales Table).
first 90% should mean first 90% by some order, so in this case, which 108 rows (of the 120) do you want to take into consideration?
with
the_sample as
(select 1 the_pid,10 the_sale,1 the_order from dual union all
select 1 the_pid,20 the_sale,2 the_order from dual union all
select 1 the_pid,15 the_sale,3 the_order from dual union all
select 1 the_pid,12 the_sale,4 the_order from dual union all
select 1 the_pid,12 the_sale,5 the_order from dual union all
select 1 the_pid,13 the_sale,6 the_order from dual union all
select 1 the_pid,19 the_sale,7 the_order from dual union all
select 1 the_pid,11 the_sale,8 the_order from dual union all
select 1 the_pid,15 the_sale,9 the_order from dual union all
select 1 the_pid,12 the_sale,10 the_order from dual union all
select 2 the_pid,25 the_sale,1 the_order from dual union all
select 2 the_pid,22 the_sale,2 the_order from dual union all
select 2 the_pid,22 the_sale,3 the_order from dual union all
select 2 the_pid,23 the_sale,4 the_order from dual union all
select 2 the_pid,29 the_sale,5 the_order from dual union all
select 2 the_pid,21 the_sale,6 the_order from dual union all
select 2 the_pid,25 the_sale,7 the_order from dual union all
select 2 the_pid,22 the_sale,8 the_order from dual
select the_pid,the_sum,the_avg
  from (select the_pid,
               sum(the_sale) over (partition by the_pid order by the_order) the_sum,
               round(avg(the_sale) over (partition by the_pid order by the_order),2) the_avg,
               the_order,
               floor((0.9 * max(the_order) over (partition by the_pid))) to_pick
          from the_sample
where the_order = to_pickRegards
Etbin