Answer Posted / 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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