In
the context of DATA step processing, the terms reading, combining
and modifying have these meanings:
refers to opening a
SAS data set and bringing an observation into the program data vector
for processing.
refers to reading data
from two or more SAS data sets and processing them by
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updating a master data set with
a transaction data set
refers to using the
MODIFY statement to update information in a SAS data set in place.
The MODIFY statement can save disk space because it modifies data
in place, without creating a copy of the data set. You can modify
a SAS data set with programming statements or with information that
is stored in another data set.