sas如何根据另一数据集的观测来筛选变量?本人是sas新手,想实现一个简单的功能.有have和hav

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data have;
input (x y z) ($);
datalines;
a b ca b ca b ca b c;run;data have1;
input code $;
datalines;
xy;run;proc sql noprint;
select code
into:var_list separated by
from have1;
quit;data have2;
set have(keep=&var_list.);
run;proc print data=have2 noobs;
run;