Group by- Max values+equal values

Question

Hi Experts,
I am looking for a query where i can group the data accordingly and exclude the rows which i don't need.please help to arrive this.
i have the data like this in my table
Cust_id type count
10 abc 19
10 abcde 19
10 abcde 8
20 e 8
20 u 4
30 f 30
I need the out put like this
Cust_id type count
10 abc 19
10 abcde 19
20 e 8
30 f 30
Thanks
Bharat

Answer 1

This?
SQL>  with abc as
  2   (
  3   select 10 Cust_id,'abc' type,19 cnt from dual union all
  4   select 10, 'abcde', 19 cnt from dual union all
  5   select 10, 'abcde', 8 cnt from dual union all
  6   select 20, 'e', 8 cnt from dual union all
  7   select 20, 'u', 4 cnt from dual union all
  8   select 30, 'f', 30 cnt from dual
  9   )
10   select cust_id,type,cnt
11   from
12   (
13     select cust_id,type,cnt,
14            count(*) over(PARTITION BY cust_id,cnt) cnt1
15     from
16     (
17       select cust_id,type,cnt,
18              rank() over(PARTITION BY cust_id ORDER by cnt DESC) rn
19       from abc
20     )
21     where rn = 1
22   )
23   where cnt1 = 1;
   CUST_ID TYPE         CNT
        20 e              8
        30 f             30