data pop_21sheep pop_22sheep;
set work.fxsheep;
           if city in ('3421') then output pop21sheep;
           if city in ('3422') then output pop22sheep;
run;


proc sort data =pop_21sheep ;
by vill;
run;
proc summary data= pop_21sheep ;
var cnt inv;
by  vill;
id cty;
output out=vill_a sum=hhnum inv;
run;proc sort data =pop_22sheep ;
by vill;
run;
proc summary data= pop_22sheep ;
var cnt inv;
by  vill;
id cty;
output out=vill_a sum=hhnum inv;
run;
导出。。。
这样的(fxsheep中3421/3422/3423)很多，如何实现批量提取 并排序，然后导出？