** PROC Contents;
proc contents data=sashelp.class out=a;
run;

** SQL Dictionary table;
Proc sql;
   create table b as
    select distinct * from dictionary.columns
        where libname="SASHELP" and memname="CLASS";
quit;

** SASHELP.Vcolum;
data c;
   set sashelp.vcolumn;
   where libname="SASHELP" and memname="CLASS";
run;

可以用
PROC CONTENTS DATA= libref._ALL_ NODS ;
或者
PROC DATASETS;
       CONTENTS DATA=libref._ALL_ NODS;  
QUIT;
语句
libref就是你数据集的名字

好好~~