orcle数据库生成随机数字

CREATE OR REPLACE
function getEAC001 return varchar2 is/*生成EAC001，规则：大写字母c+当前注册时间到秒20170804112040加6位随机数字码 */
  Result varchar2(32);
  i number(10):=0;
begin
  Result:='C' || to_char(sysdate,'yyyyMMddHH24miss');
  while i < 6 loop
        Result:=Result || trunc(dbms_random.value(0,10));
        i := i + 1;
      end loop;
  return(Result);
end getEAC001;