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Mysql按日、周、月进行分组统计

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(s