2月29号代表什么

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SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1574670,1764942,3211296,1654931,793800,450632,1004481,1854018,1130068,1022455,629338,94820,1383453,735051,859082,1698104,1089396,395589,522353,911706,550351,592976,388809,81460,1082254,568534,697107,446196,1196810,537205) ORDER BY field (ArticleID,1574670,1764942,3211296,1654931,793800,450632,1004481,1854018,1130068,1022455,629338,94820,1383453,735051,859082,1698104,1089396,395589,522353,911706,550351,592976,388809,81460,1082254,568534,697107,446196,1196810,537205)