proc format;
  value school
      5-11="Elementary" 12-14="Junior High" 15-19="High School";
run;
proc sql;
  create table Groups as
    select Name, Age, Height, Weight,
           put(Age,school.) as SchoolGroup
      from sashelp.class
      order by Age, Height;
quit;
data YoungestBySchoolGroup;
  set Groups;
  by SchoolGroup notsorted;
  if first.SchoolGroup;
run;
proc print data=YoungestBySchoolGroup;
  title1 "Youngest Student in each School Group";
run;