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

Please refer to Usage Note 37581: How can I eliminate duplicate observations from a large data set without sorting, http://support.sas.com/kb/37/581.html . Usage Note 37581 shows how PROC SUMMARY can be used to more efficiently remove duplicates without the use of sorting.