【转】Mysql 根据时间戳按年月日分组统计

create_time时间格式

        SELECT DATE_FORMAT(create_time,‘%Y%u‘) weeks,COUNT(id) COUNT FROM role GROUP BY weeks;

        SELECT DATE_FORMAT(create_time,‘%Y%m%d‘) days,COUNT(id) COUNT FROM role GROUP BY days; 
        SELECT DATE_FORMAT(create_time,‘%Y%m‘) months,COUNT(id) COUNT FROM role GROUP BY months 

        create_time时间戳格式

        SELECT FROM_UNIXTIME(create_time,‘%Y%u‘) weeks,COUNT(id) COUNT FROM role GROUP BY weeks; 
        SELECT FROM_UNIXTIME(create_time,‘%Y%m%d‘) days,COUNT(id) COUNT FROM role GROUP BY days; 
        SELECT FROM_UNIXTIME(create_time,‘%Y%m‘) months,COUNT(id) COUNT FROM role GROUP BY months 

原文：http://www.cnblogs.com/sped/p/4414660.html