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;