Appending
Overview
Another way to combine SAS data sets is to append one data set to
another using the APPEND procedure. Although appending and
concatenating are similar, there are some important differences
between the two methods. Whereas the DATA step creates an entirely
new data set when concatenating, PROC APPEND simply adds the
observations of one data set to the end of a “master” (or BASE)
data set. SAS does not create a new data set nor does it read the
base data set when executing the APPEND procedure.
To append SAS data sets, you specify a BASE= data set, which is the data set to which observations are added and then specify a DATA= data set, which is the data set containing the observations that are added to the base data set. ...
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