Answer Posted / chiranjeevi

MERGE:Merge statement is used to combine two datasets,The
two datasets can be combined by matching variable should by
specify by using statement calld 'by' in the data step.


SET:SET statement concatenates the two data sets by matching
variable.

Difference:when ever we are using the merge statement it
will over writes the existing and the similar observations
across two datasets,But where as the set statement doesn't
overwrites it.

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