037-30: The Mystery of the PROC SORT Options ... - SAS
the rest of this paper I will be using the alias NODUP for the NODUPRECS option. DEFINING NODUP AND NODUPKEY OPTIONS The NODUP option checks for and eliminates duplicate observations. If you specify this option, PROC SORT compares all variable values for each observation to those for the previous observation that was written to the output data set.
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