create_time時間格式

        SELECT DATE_FORMAT(create_time,'%Y%u') weeks FROM role GROUP BY weeks;  
        SELECT DATE_FORMAT(create_time,'%Y%m%d') days FROM role GROUP BY days;   
        SELECT DATE_FORMAT(create_time,'%Y%m') months FROM role GROUP BY months   

create_time時間戳格式

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