等位分数线什么意思

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select * from tbl_Articles WHERE ArticleID=287405 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=287405 LIMIT 0,1
select * from tbl_Articles_sphinx where id=287405 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1517844,1488695,1087862,1084303,1099175,1507589,1065683,1123521,1129939,993095,1076786,1123759,1073632,1068296,1364827,1097097,1067397,1460519,1088544,1102222,2253341,1045643,1647042,1082267,1076732,1351255,1298900,1093897,1406100,1078414) ORDER BY field (ArticleID,1517844,1488695,1087862,1084303,1099175,1507589,1065683,1123521,1129939,993095,1076786,1123759,1073632,1068296,1364827,1097097,1067397,1460519,1088544,1102222,2253341,1045643,1647042,1082267,1076732,1351255,1298900,1093897,1406100,1078414)