This is a cute little PLSQL block. It really is for learning the basics of PLSQL programming. Make sure before running it to set SERVEROUTPUT at your SQL prompt
SET SERVEROUTPUT ON SIZE=999999
The following PLSQL will display ASCII table
declare
i number;
j number;
k number;
begin
for i in 2..15 loop
for j in 1..16 loop
k:=i*16+j;
dbms_output.put((to_char(k,'000'))||':'||chr(k)||' ');
if k mod 8 = 0 then
dbms_output.put_line('');
end if;
end loop;
end loop;
end;