Answer Posted / cutepa1

Almost all the above answers are right, except one or few.
Here I provide a clear insight into _n_ variable. This is an
automatic variable of PDV(Program Data Vector) that returns
the no. of observations that it has iterated. There are
such variables like _error_, end=, in=, first.by-variabke,
last.by-variable,etc.. All these variables will not be
displayed in the target output.
Ex:
data new;
set ora.emp;
if _n_ >= 2 and _n_ <= 6 then output;
run;
/* as _n_ returns 'n'th observation our statement is to save
those obs when _n_ returns the value between 2 and 6. Hence
the 5 obs of the specified dataset between second and six
are saved into 'new'.

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