无详细内容 无 select createdtime from `z_2015-09-15` where deviceid='460040271516782' limit 1;select createdtime from `z_2015-09-15` where deviceid='460040271516782' order by id desc limit 1;
select createdtime from `z_2015-09-15` where deviceid='460040271516782' limit 1;select createdtime from `z_2015-09-15` where deviceid='460040271516782' order by id desc limit 1;