The most efficient way is using IF-ELSE in a data step,once for all, no need PROC SORT firstly.
data have;
input color $ val;
datalines;
Green 5
Green 8
Green 3
Green 1
Green 10
Yellow 9
Yellow 2
Yellow 6
Yellow 8
Yellow 12
Yellow 5
Yellow 8
Purple 5
Purple 2
Purple 6
;
proc freq data=have noprint;
table color/out=color nopercent nocum;
run;
data _null_;
if _n_=1 then do;
call execute('data ');
do until(last);
set color end=last;
call execute(color);
end;
call execute(';set have; select(color);');
end;
set color end=eof;
call execute(cat('when("',color,'") output ',color,';'));
if eof then call execute('otherwise;end;run;');
run;
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