可以用SAS里面的dictionary， 举例如下，

data data1;
  x=1;
  y=2;
run;

data data2;
  x=3;
  z=5;
run;

data data3;
  x=5;
  w=6;
run;

proc sql;
  select a.name as name
  from (select name from dictionary.columns where libname = "WORK" and memname = "DATA1") a,
       (select name from dictionary.columns where libname = "WORK" and memname = "DATA2") b,
           (select name from dictionary.columns where libname = "WORK" and memname = "DATA3") c
  where a.name = b.name and b.name = c.name;
quit;

proc sql;
   create table common_var as
    select distinct name, memname
          from dictionary.columns
          where libname="SASHELP" /*and upcase(memname) in (your-dataset-list-of-interest)*/
          group by name
          having count(distinct memname)>1;
quit;

对于小数据集，还是可以的。