You may need to reshape your data and to format your graph to make it pretty. Here is a simple example.

data a;
input id $ x flag $;
idflag=catt(id,'-',flag);
cards;
1 20 x
1 23 y
2 21 x
2 25 y
3 25 x
3 20 y
4 30 x
4 40 y
;

proc print;run;

proc gchart data=a;
vbar idflag / sumvar=x;
run;

proc sgplot data=a;
   vbar idflag/ response=x ;
run;

谢谢！