How to limit rows to only those where there are duplicates of a specific column? - response (6) by geetika

I have a teradata query which uses aggregate function and GROUP BY. GROUP BY restrictes the results to half for eg. without using aggregate/group by, query fetches 26,000 records and with aggreagate/group by it restrictes the resulting rows to 13,000 Only. How I can display all duplicate records in my table with aggregate function and GROUP BY.