What is the difference between nodup and nodupkey options?
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Answer Posted / shalabh tyagi
Nodup: Checks for duplicacy among the variables in a row and
keeps the 1st row of that observaion in the final output and
deletes the rest
Nodupkey: Checks for the duplicacy among the variables
specified in "by" statement and keeps the 1st row of the
observaion and deletes the rest
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