Using the MODIFY Statement
When
you submit a DATA step with a MERGE, UPDATE, or SET statement, and
if the output data set already exists, SAS creates a second copy of
the output data set. Once execution is complete, SAS deletes the original
copy of the data set. As a result, the original data set is replaced
by the new data set with the same name. The new data set can contain
a different set of variables than the original data set. The attributes
of the variables in the new data set can be different from those of
the original data set.
In contrast, when you submit a DATA step with a MODIFY statement, the input and output data sets must be ...
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