oracle通过身份证号码获取年龄

select trunc((to_char(sysdate, \'yyyyMMdd\') -
             to_char(to_date(substr(\'110101201701010016\', 7, 8),
                              \'yyyy-MM-dd\'),
                      \'yyyyMMdd\')) / 10000) 年龄
  from dual;

执行结果: