Proc sort procedure now with additional options

Every one might be aware that till SAS 9.2 we were able to remove the duplicate observations or duplicate records with PROC SORT procedure using options like NODUPKEYS or NODUPS.


Now in SAS 9.3 addition options are available like

NOUNIQUEKEY

checks for and eliminates observations from the output data set that have a unique sort key. A sort key is unique when the observation containing the key is the only observation within a BY group. An observation has a unique sort key when it is the only observation within a BY group.


NOUNIQUEREC

checks for and eliminates observations from the output data set that are adjacently unique. PROC SORT only writes to the output data set observations that it determines are not unique. For example, during output, observation B is compared to observation A that precedes it and then to observation C that follows it. If observation B has variable values that differ from observation A’s or observation C’s variable values, then observation B is considered unique and is not written to the output data set.
When the UNIQUEOUT= option is specified with NOUNIQUEREC, then unique observations are written to the data set specified by the UNIQUEOUT= option.

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