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  2. RPG400-L
  3. April 2006

Re: Declare a key on a subfile... is it possible?
Is it possible to declare a subfile with a key on a particular field of the subfile, so I will be able to chain in my RPG ILE program to find this particular value? 

No.
Or must I scan all the subfile record by record to verify the presence of the searched zip code?
I'd suggest that as you add each record to your subfile, you also add the zip code to an array. Then you can use %LOOKUP to check if you've already added that zip code.

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