sas如何獲取某個變量的第壹個和最後壹個值

select name into:first_name from (select monotonic() as num,* from sashelp.class) having num=min(num);

select name into:last_name from (select monotonic() as num,* from sashelp.class) having num=max(num);

quit;

or data step

data _null_;

set sashelp.class end=last;

if _n_=1 then call symputx('first_name',name);

if last then call symputx('last_name',name);

run;

%put& first_name& last_name;