mysql怎么查询今天的数据

建表：

CREATE  TABLE  ` order ` (
   `id`  INTEGER  UNSIGNED  NOT  NULL  AUTO_INCREMENT,
   `order_name`  VARCHAR (45)  NOT  NULL ,
   `order_time` DATETIME  NOT  NULL ,
   PRIMARY  KEY  (`id`)
)

查询当天（今天）的数据

SELECT  *  FROM  ` order `  WHERE  TO_DAYS(order_time) = TO_DAYS(NOW())

查询昨天的数据

SELECT  *  FROM  ` order `  WHERE  TO_DAYS(NOW()) - TO_DAYS(order_time) = 1

查询当月（本月）的数据

SELECT * FROM `order` WHERE DATE_FORMAT(order_time, '%Y%m') = DATE_FORMAT(CURDATE(), '%Y%m')