Hi DB_ECON
You can do that very easily by just appending and then sorting them.
Suppose your dataset name is A and you need output in B
Program:-
data B;
set A A;
run;
proc sort data=B;
by ID;
run;
You will get your required result in B dataset.
You can try the following code( as single is your original data set )
data new ;
set single;
do i=1 to 2;
output;
end;
run;
proc print data=new(drop=i) noobs;
run;
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