oracle 数据库 时间差 年数、月数、天数、小时数、分钟数、秒数

 declare

 l_start date := to_date('2015-04-29 01:02:03', 'yyyy-mm-dd hh24:mi:ss');
 l_end date := to_date('2015-05-15 11:22:33', 'yyyy-mm-dd hh24:mi:ss');

 l_ym interval year to month;
 l_ds interval day to second;
 l_year number;
 l_month number;
 l_day number;
 l_hour number;
 l_minute number;
 l_second number;
 l_str varchar2(100);
 begin
 l_ym := numtoyminterval(trunc(months_between(l_end, l_start)), 'month');
 l_ds := numtodsinterval(l_end -
 add_months(l_start,
 trunc(months_between(l_end, l_start))),
 'day');

 select extract(year from l_ym), extract(month from l_ym)
 into l_year, l_month
 from dual;

 select extract(day from l_ds),
 extract(hour from l_ds),
 extract(minute from l_ds),
 extract(second from l_ds)
 into l_day, l_hour, l_minute, l_second
 from dual;

 l_str := lpad(to_char(l_year), 4, '') || '年' ||
 lpad(to_char(l_month), 2, '') || '月' ||
 lpad(to_char(l_day), 2, '') || '天' || ' ' ||
 lpad(to_char(l_hour), 2, '') || ':' ||
 lpad(to_char(l_minute), 2, '') || ':' ||
 lpad(to_char(l_second), 2, '');

 dbms_output.put_line(l_str);

 end;