mysql中如何查詢表的第一條和最后一條記錄

無詳細內容 無 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;

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