Answer / chandrakanth

Proc sort nodupkey will remove any repeated observations based on by variable you mention in the proc sort, whereas proc sort nodup will remove all the repeated observation irrespective of the mentioned by variable . Hope this answers your question let me know if you need more details.

Answer / venkatesh

nodup: it deletes duplicates(column wise duplicates).
nodupkey: it deletes row wise duplicates according to
your by variable;
ex: id name
100 nani
101 ravi
100 nani
101 kali
nodup result:
id name
100 nani
101 ravi
101 kali

nodupkey result
100 nani
101 ravi

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