我的订单表使用的create_time时间戳来表示下单时间的,如果取当日订单好计算,但是如果取七天内的订单呢?
如果我想要得到七天内的每一天的订单数量又该怎么计算呢?真是郁闷,希望大神解答下哈,谢谢了。
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我的订单表使用的create_time时间戳来表示下单时间的,如果取当日订单好计算,但是如果取七天内的订单呢?
如果我想要得到七天内的每一天的订单数量又该怎么计算呢?真是郁闷,希望大神解答下哈,谢谢了。
七天内的订单:
<code>SELECT * FROM t_order WHERE DATE_SUB(CURDATE(), INTERVAL 7 DAY) </code>
七天内每天的订单数量,先用where条件查出七天内的订单,再用group by 对每天进行分组就行了:
<code>SELECT DATE(create_time) createtime,COUNT(*) FROM t_order WHERE DATE_SUB(CURDATE(), INTERVAL 7 DAY) </code>
循环取肯定不好,最起码不是最好的。
稍微进步点的:一下子取7天的,然后在代码中分割,代码中分割数组还是很快的。
如果数据量很大跑数组不现实,那就sql语句吧,一次性取出来也是可以的。
等高手展示sql。
你也可以将条件设置DATEDIFF(CURDATE(), create_time)
你要是让别人写,起码得告诉别人日期字段,销量字段等等是什么是吧
你要是问的话,那就只能用条件where了..
你可以在程序中先计算出一个日期,如果 strtotime(date('Y-m-d 00:00:00', strtotime('-7 days')) 得到7天前那天0点的时间戳,然后去where不就行了吗。
不建议用 MySQL 做统计,可以在每次生成一个订单时,把订单放到 redis 中
方案可以是每天一个集合.把每天的订单号都放到这个集合里
别管怎么统计,都很方便,比如统计某一天的订单,直接获取那天集合中的订单数据,不用走 MySQL

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