如何理解数据库的三级模式

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select * from tbl_Articles WHERE ArticleID=483833 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=483833 LIMIT 0,1
select * from tbl_Articles_sphinx where id=483833 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1065795,1096068,1089832,1106078,1109925,1112642,1113471,1063799,1063867,1094053,1087793,1104855,1082936,1084667,1071507,1079978,1077976,1083421,1093062,1092367,1082173,1041531,1060241,1059016,1071089,1072797,1053922,1094811,1100392,1095812) ORDER BY field (ArticleID,1065795,1096068,1089832,1106078,1109925,1112642,1113471,1063799,1063867,1094053,1087793,1104855,1082936,1084667,1071507,1079978,1077976,1083421,1093062,1092367,1082173,1041531,1060241,1059016,1071089,1072797,1053922,1094811,1100392,1095812)