什么是单指数模型如题谢谢了

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select * from tbl_Articles WHERE ArticleID=1362572 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=1362572 LIMIT 0,1
select * from tbl_Articles_sphinx where id=1362572 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1071954,1106192,1094429,1062866,1086514,1067901,1091703,1105645,990402,1048354,1098095,1080593,1097801,1063135,1109607,1061838,1075859,1064251,1072721,1063559,1064447,1066612,1096388,1117574,1110858,1088570,1081699,1089962,1110608,1111316) ORDER BY field (ArticleID,1071954,1106192,1094429,1062866,1086514,1067901,1091703,1105645,990402,1048354,1098095,1080593,1097801,1063135,1109607,1061838,1075859,1064251,1072721,1063559,1064447,1066612,1096388,1117574,1110858,1088570,1081699,1089962,1110608,1111316)