Getting top 9, aggregating the rest - challenge with SUM

Question

Dear,
I'd like to get the top 9 customers and aggregate the remaining to one number.
My query is:
select k.kundenid, k.KDNR, k.FIRMA_1, sum(a.auftrag_total)
from auftrag a, kunden k
where a.kunde_id=k.kundenid and
TO_CHAR(a.DATUM,'YYYY')=TO_CHAR(sysdate,'YYYY')
group by k.kundenid, k.KDNR, k.FIRMA_1
order by 4 desc
I have tried with DENSE_RANK() but it gets complicated to combine this with SUM()
Can someone help?
Kind regards..........Lorenz

Answer 1

I seem to have hit a bug in XE on windows XP. The following query should work but the 10th record only includes the 10th ranked total, not the total of 10 thru 16.
If I change the with statement to a create table, the query works. Also, if I just use the second half of the union all I get the correct results. The combination of with and union/union all seems to fail.
create table auftrag(kunde_id number, kdnr varchar2(20), datum date, auftrag_total number);
insert into auftrag (select 1  kunde_id, 'cust1'  kdnr, sysdate datum, 1200 auftrag_total from dual);
insert into auftrag (select 1  kunde_id, 'cust1'  kdnr, sysdate datum, 600  auftrag_total from dual);
insert into auftrag (select 2  kunde_id, 'cust2'  kdnr, sysdate datum, 1600 auftrag_total from dual);
insert into auftrag (select 2  kunde_id, 'cust2'  kdnr, sysdate datum, 700  auftrag_total from dual);
insert into auftrag (select 3  kunde_id, 'cust3'  kdnr, sysdate datum, 500  auftrag_total from dual);
insert into auftrag (select 3  kunde_id, 'cust3'  kdnr, sysdate datum, 1300 auftrag_total from dual);
insert into auftrag (select 4  kunde_id, 'cust4'  kdnr, sysdate datum, 200  auftrag_total from dual);
insert into auftrag (select 5  kunde_id, 'cust5'  kdnr, sysdate datum, 1500 auftrag_total from dual);
insert into auftrag (select 6  kunde_id, 'cust6'  kdnr, sysdate datum, 800  auftrag_total from dual);
insert into auftrag (select 7  kunde_id, 'cust7'  kdnr, sysdate datum, 1400 auftrag_total from dual);
insert into auftrag (select 8  kunde_id, 'cust8'  kdnr, sysdate datum, 300  auftrag_total from dual);
insert into auftrag (select 9  kunde_id, 'cust9'  kdnr, sysdate datum, 2000 auftrag_total from dual);
insert into auftrag (select 10 kunde_id, 'cust10' kdnr, sysdate datum, 1900 auftrag_total from dual);
insert into auftrag (select 11 kunde_id, 'cust11' kdnr, sysdate datum, 400  auftrag_total from dual);
insert into auftrag (select 12 kunde_id, 'cust12' kdnr, sysdate datum, 1800 auftrag_total from dual);
insert into auftrag (select 13 kunde_id, 'cust13' kdnr, sysdate datum, 900  auftrag_total from dual);
insert into auftrag (select 14 kunde_id, 'cust14' kdnr, sysdate datum, 1000 auftrag_total from dual);
insert into auftrag (select 15 kunde_id, 'cust15' kdnr, sysdate datum, 1700 auftrag_total from dual);
insert into auftrag (select 16 kunde_id, 'cust16' kdnr, sysdate datum, 100  auftrag_total from dual);
create table kunden(kundenid number, firma_1 varchar2(20));  
insert into kunden (select 1  kundenid, 'desc1'  firma_1 from dual);
insert into kunden (select 2  kundenid, 'desc2'  firma_1 from dual);
insert into kunden (select 3  kundenid, 'desc3'  firma_1 from dual);
insert into kunden (select 4  kundenid, 'desc4'  firma_1 from dual);
insert into kunden (select 5  kundenid, 'desc5'  firma_1 from dual);
insert into kunden (select 6  kundenid, 'desc6'  firma_1 from dual);
insert into kunden (select 7  kundenid, 'desc7'  firma_1 from dual);
insert into kunden (select 8  kundenid, 'desc8'  firma_1 from dual);
insert into kunden (select 9  kundenid, 'desc9'  firma_1 from dual);
insert into kunden (select 10 kundenid, 'desc10' firma_1 from dual);
insert into kunden (select 11 kundenid, 'desc11' firma_1 from dual);
insert into kunden (select 12 kundenid, 'desc12' firma_1 from dual);
insert into kunden (select 13 kundenid, 'desc13' firma_1 from dual);
insert into kunden (select 14 kundenid, 'desc14' firma_1 from dual);
insert into kunden (select 15 kundenid, 'desc15' firma_1 from dual);
insert into kunden (select 16 kundenid, 'desc16' firma_1 from dual);
commit;
with t_rank as (
   select to_char(kunde_id) kunde_id, kdnr, firma_1, sum(auftrag_total) sum_at,
      row_number() over (order by sum(auftrag_total) desc) rn
   from auftrag, kunden
   where kunde_id = kundenid
   and trunc(datum,'y') = trunc(sysdate,'y')
   group by kunde_id, kdnr, firma_1)     
select *
from t_rank
where rn <= 9
union all
select 'Rest', 'Rest', 'Rest', sum(sum_at), 10
from t_rank
where rn > 9
order by 5