oracle中四种不同方法循环输出1-10...

set serveroutput on
declare
  i int:=10;
  j int:=0;
  begin
   loop
      j:=j+1;
      if j<11 then
        dbms_output.put_line(j);
      elsif j>11 then
        exit;
      end if;
   end loop;
  end;

set serveroutput on
declare
  i int:=11;
  j int:=0;
  begin
    for j in 1..i loop
      if j<11 then
        dbms_output.put_line(j);
      elsif j>11 then
        exit;
      end if;
   end loop;
  end;

set serveroutput on
declare
  i int:=11;
  j int:=1;
  begin
    while j<11 loop
      dbms_output.put_line(j);
      j:=j+1;
   end loop;
  end;

set serveroutput on
declare
  i int:=11;
  j int:=1;
  begin
   loop
      exit when j>10 ;
      dbms_output.put_line(j);
      j:=j+1;
   end loop;
  end;