需求描述
要对某个表的销量或者数量按照每日、每周、每月进行统计
解决方法
1)按天统计:
select DATE_FORMAT(start_time,'%Y%m%d') days,count(product_no) count from test group by days;
2)按周统计:
select DATE_FORMAT(start_time,'%Y%u') weeks,count(product_no) count from test group by weeks;
3)按月统计:
select DATE_FORMAT(start_time,'%Y%m') months,count(product_no) count from test group bymonths;