众数和中位数是什么意思

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SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1091793,1122154,381519,880084,3505236,3481261,2116804,1121226,362067,1120348,2706924,1116097,1102682,2442341,1118511,1119504,3479050,3236304,379758,1116329,1112316,389947,771499,1098497,1030438,3136381,1119023,1093212,1098377,365916) ORDER BY field (ArticleID,1091793,1122154,381519,880084,3505236,3481261,2116804,1121226,362067,1120348,2706924,1116097,1102682,2442341,1118511,1119504,3479050,3236304,379758,1116329,1112316,389947,771499,1098497,1030438,3136381,1119023,1093212,1098377,365916)