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create table Your_Customer_Table (id, name, num_id) as ( select 1, 'Jenny' , 456 from dual union all select 2, 'Jenny' , 456 from dual union all select 3, 'Ben' , 456 from dual union all select 4, 'Ursula' , 879 from dual union all select 5, 'Mike' , 145 from dual union all select 6, 'Mike' , 145 from dual union all select 7, 'Nick' , 954 from dual );
7 rows affected
select min(id) id, name, num_id from ( select id, name, num_id, count(distinct name) over (partition by num_id) cnt from Your_Customer_Table ) t where cnt > 1 group by name, num_id order by 1 ;
ID
NAME
NUM_ID
1
Jenny
456
3
Ben
456