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Is there a better way to insert records when wanting to add records to a
file from an identical file while avoiding duplicate records?

insert into lib1.file1
 select * from lib2.file1
  where (key1 || key2 || key3 ||
         key4 || key5 || char(key6))
    not in (select
             (key1|| key2 || key3 ||
              key4 || key5 || char(key6))
            from lib1.file1)

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