can combine data sets with one-to-one merging (combining) by
including multiple SET statements in a DATA step. When you perform
one-to-one merging, the new data set contains all the variables
from all the input data sets. If the data sets contain same-named
variables, the values that are read in from the last data set
replace those that were read in from earlier ones. The number of
observations in the new data set is the number of observations in
the smallest original data set.
To append the observations from one data set to another data set, you concatenate them by specifying the data set names in the SET statement. When SAS concatenates, ...
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