What do you mean by a blanket alias? All fields renamed in a similar way, such as stripping off the first two characters and then replacing underscores with blanks? I'm not aware of a way. So far as I know, every field must be given an explicit alias. You can also rename fields after the load with a rename statement, but again, I think every field must be renamed explicitly. I suppose you could consider QUALIFY to be a sort of blanket alias, since you can change the names of all fields in a table at once, but only in a very specific way.
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