创建时间是timestamp类型，根据年月日的日期是无法查询到的，所以我们需要通过转换数据格式进行查询。

查询一段时间内的数据。

一、beteen...and

SELECT * FROM weigh WHERE Business_card_number LIKE '华A%'
AND DATE_FORMAT(N_time,'%Y-%m-%d %H:%i:%s') BETWEEN '2022-03-28 15:00:00' AND '2022-05-24 24:00:00'

二、大于号and小于号

SELECT * FROM weigh WHERE Business_card_number LIKE '华A%' 
AND DATE_FORMAT(N_time,'%Y-%m-%d %H:%i:%s') >= '2022-03-28 15:00:00' 
AND DATE_FORMAT(N_time,'%Y-%m-%d %H:%i:%s') <= '2022-05-24 24:00:00'

三、转换成UNIX_TIMESTAMP

SELECT * FROM weigh WHERE Business_card_number LIKE '华A%'
AND UNIX_TIMESTAMP(N_time) BETWEEN UNIX_TIMESTAMP('2022-03-28 15:00:06') AND UNIX_TIMESTAMP('2022-05-24 16:43:06')

2022-05-24 16:43:06没有错误，但是查询就不对，复制数据库里的值改动一下就对了，迷茫。。。