How to remove duplicated records\observations WITHOUT sorting in SAS？

Question

I wonder if there is a way to unduplicate records WITHOUT sorting?Sometimes, I want to keep original order and just want to remove duplicated records.

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Answer 1

I think the short answer is no, there isn't, at least not a way that wouldn't have a much bigger performance hit than a method based on sorting.

There may be specific cases where this is possible (a dataset where all variables are indexed? A relatively small dataset that you could reasonably load into memory and work with there?) but this wouldn't help you with a general method.

Something along the lines of Chris J's solution is probably the best way to get the outcome you're after, but that's not an answer to your actual question.