一中各表是什么意思

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select * from tbl_Articles WHERE ArticleID=636951 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=636951 LIMIT 0,1
select * from tbl_Articles_sphinx where id=636951 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(447842,451610,473906,1098653,426472,411573,1120115,1114820,399651,458109,412132,1303492,1084343,465194,463941,389405,1095414,1117924,446793,380061,1303802,445047,469537,1107020,1119920,427719,1103390,403481,1096651,1110291) ORDER BY field (ArticleID,447842,451610,473906,1098653,426472,411573,1120115,1114820,399651,458109,412132,1303492,1084343,465194,463941,389405,1095414,1117924,446793,380061,1303802,445047,469537,1107020,1119920,427719,1103390,403481,1096651,1110291)