Answer Posted / cutepa1

Thanks Rajesh, Here I got the appropriate answer for the
above question. A PDV has got such two variables like
'first.<BY-variable> and last.<BY-variable> apart from other
temporary variables. Here a BY-variable is the variable that
is mentioned in BY statement. a first.<var> returns 1 when a
first obs of that variable's datavalue is iterated or
contributed and returns 0 for the remaining other obs whose
datavalue of that specified variable in the BY-statement.
Respectively it returns 1 for when last obs is contributed
with the usage of last.<BY-variable> and returns 0 for the
rest of the observations.
Here I got an example
=======
data ex;
set emp; /* a source table retrived from Oracle emp */
by deptno; /* we can call 'deptno' as our BY-variable */
lead=first.deptno; /* new variable called lead that returns
the value either 1 or 0 basing on deptno*/
follow=last.deptno;
run;

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