Ab Initio is one of the ETL tools that Terdata has experience with. Teradata can be contacted for input on methodology around ETL migration of Teradata utilities to Ab Initio. COntact your local Account Team thru your managment.
May be as simple as this. Did not check the syntax and may have misunderstood the question - the key element to eliminate 'duplicates' is the distinct DML statement.
select distinct e.e_stn
from e,
s
where e.e_s_rec_key
= s.s_rec_key
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