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Agregação de String no ORACLE 10g com três colunas


Para o Oracle 10, usando sua abordagem - o problema é o particionamento em sua consulta interna.
WITH tab as (
SELECT 1 as fdate,     'Apple' as fruit,    1 as num from dual union
SELECT 1 as fdate,     'Apple' as fruit,    2 as num from dual union
SELECT 1 as fdate,     'Apple' as fruit,    3 as num from dual union
SELECT 1 as fdate,     'Kiwi' as fruit,    6 as num from dual union
SELECT 1 as fdate,     'Kiwi' as fruit,    10 as num from dual union
SELECT 2 as fdate,     'Apple' as fruit,    4 as num from dual union
SELECT 2 as fdate,     'Apple' as fruit,    5 as num from dual union
SELECT 2 as fdate,     'Apple' as fruit,    6 as num from dual union
SELECT 2 as fdate,     'Kiwi' as fruit,    4 as num from dual union
SELECT 2 as fdate,     'Kiwi' as fruit,    7 as num from dual )
SELECT fdate, fruit,LTRIM(MAX(SYS_CONNECT_BY_PATH(num,','))
    KEEP (DENSE_RANK LAST ORDER BY curr),',') AS fruits_agg
    FROM   (SELECT fdate,
            fruit,
            num,
            ROW_NUMBER() OVER (PARTITION BY fdate, fruit ORDER BY num) AS curr,
            ROW_NUMBER() OVER (PARTITION BY fdate, fruit ORDER BY num) -1 AS prev
     FROM   tab)
  GROUP BY fdate,fruit
  CONNECT BY prev = PRIOR curr AND fruit = PRIOR fruit AND fdate = PRIOR fdate
 START WITH curr = 1;

Dá:
FDATE             FRUIT   FRUITS_AGG                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         
1                "Kiwi"  "6,10"                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             
1                "Apple" "1,2,3"                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            
2                "Kiwi"  "4,7"                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              
2                "Apple" "4,5,6"

A solução Oracle 11 é muito mais fácil:
WITH tab as (
SELECT 1 as fdate,     'Apple' as fruit,    1 as num from dual union
SELECT 1 as fdate,     'Apple' as fruit,    2 as num from dual union
SELECT 1 as fdate,     'Apple' as fruit,    3 as num from dual union
SELECT 1 as fdate,     'Kiwi' as fruit,    6 as num from dual union
SELECT 1 as fdate,     'Kiwi' as fruit,    10 as num from dual union
SELECT 2 as fdate,     'Apple' as fruit,    4 as num from dual union
SELECT 2 as fdate,     'Apple' as fruit,    5 as num from dual union
SELECT 2 as fdate,     'Apple' as fruit,    6 as num from dual union
SELECT 2 as fdate,     'Kiwi' as fruit,    4 as num from dual union
SELECT 2 as fdate,     'Kiwi' as fruit,    7 as num from dual )
select fdate
     , fruit
     , listagg(num,'-') within group ( order by num ) fruit_agg
from tab
group by fdate, fruit 

Devoluções:
FDATE  FRUIT    FRUIT_AGG
1      Kiwi      6-10
1      Apple     1-2-3
2      Kiwi      4-7
2      Apple     4-5-6