1加1在什么情况下等于3

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select * from tbl_Articles WHERE ArticleID=3419150 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=3419150 LIMIT 0,1
select * from tbl_Articles_sphinx where id=3419150 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1084823,1371620,992503,1085955,1068973,1085376,1077826,983947,1069273,1083249,1066362,1067487,1077545,1047319,1082922,1061838,1047083,1063675,1071689,1063213,1054136,1065533,1080116,1053494,1052739,1079225,1063993,1084197,1061744,1063929) ORDER BY field (ArticleID,1084823,1371620,992503,1085955,1068973,1085376,1077826,983947,1069273,1083249,1066362,1067487,1077545,1047319,1082922,1061838,1047083,1063675,1071689,1063213,1054136,1065533,1080116,1053494,1052739,1079225,1063993,1084197,1061744,1063929)