我想要的结果是”Alfred Alice Barbara Carol Henry James Jane Janet Jeffrey John Joyce Judy Louise Mary
Philip Robert Ronald Thomas William“

不知道

data a;
set sashelp.class(keep= name);
run;

data combine5;
length b $200;
retain b;
if _n_=1 then b="  ";
set a end=last;
b=compbl(b)||" "||name;
if last then call symput("comb",b);
run;

%put &comb.;

或者用
proc sql noprint;
select name into: com_name separated by " "
from sashelp.class;
quit;

%put &com_name.;

非常感谢^^