_nobs.sas

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%MACRO _nobs(i_data
            );

   %local dsid nobs;
   %let nobs=0;
   %let dsid=%sysfunc(open(&i_data));
   %if &dsid>0 %then %do;
      %let nobs=%sysfunc(attrn(&dsid,nlobs));
      %let dsid=%sysfunc(close(&dsid));
   %end;
&nobs
%MEND _nobs;