--举个例子:
set serverout on
declare
v_count number;
begin
loop 
v_count :=v_count+1;
dbms_output.put_line('循环次数: '||v_count);
if v_count=10 then 
goto a;
end if;
end loop;
<<a>>
dbms_output.put_line('跳出循环');
end;