The APPEND procedure adds the observations
from one SAS data set to the end of another SAS data set.
Generally, the APPEND procedure functions the same as the APPEND statement
in the DATASETS procedure. The only difference between the APPEND procedure
and the APPEND statement in PROC DATASETS is the default for libref in the BASE= and DATA= arguments. For PROC APPEND, the default is
either WORK or USER. For the APPEND statement, the default is the libref of
the procedure input library.
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