with cte as (
	select st.PRODUCT, st.SUPPLIER, ROW_NUMBER() over (order by NULL) as id
	from store as st
)
select st1.PRODUCT, st1.SUPPLIER
from cte as st1
where not exists( 
	select *
	from cte st2
	where st1.PRODUCT = st2.PRODUCT 
		and st1.id <> st2.id
)