How to  find duplicate colums in a table?

i have a table product_info with a data in the following format.
product_id catalog_id product_info_id
aaaa bbbb xyz
dddd cccc rrr
aaaa bbbb kkk
ffff gggg ttt
dddd cccc eee
now when i select the table i want to display only the duplicate records for column product_id and catalog_id.
The result should be in the following format
product_id catalog_id product_info_id
aaaa bbbb xyz
dddd cccc rrr
aaaa bbbb kkk
dddd cccc eee
Thank you all for your help in advance.

select *
from product_info x
where x.rowid >
(select min(rowid)
from product_info y
where y.product_id = x.product_id
and y.catalog_id = x.catalog_id
Sybrand Bakker
Senior Oracle DBA

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