If there is eof to get end of file, is there an equivalent "start" option to get the first row?

[sustagens]

I know nobs can be used but just wondering if there also exists a start option since there is an "end" one.

[gamotte]

Hello,

In a data step, a variable _N_ is automatically created and contains the currently processed row number. So you can just test :
if _N_=1 then ...

[Kurt_Bremser]

Actually, _N_ contains the number of the current data step iteration. In most cases, since you only execute a set or merge statement once per iteration, this will correspond to the row number, but if you execute these statements more than once, you will get another result.

Compare this:

data test1;
set sashelp.class;
count = _N_;
run;

with this:

data test2;
do until (end_of_file);
  set sashelp.class end=end_of_file;
  count = _N_;
  output;
end;
run;