什么是两级最小差

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select * from tbl_Articles WHERE ArticleID=192458 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=192458 LIMIT 0,1
select * from tbl_Articles_sphinx where id=192458 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1091703,1091900,1089263,1102250,1112871,1099985,1080363,1121130,1101394,1078521,1069253,1056440,1062062,1010909,1101442,1096000,1061838,1085388,1086608,1065727,1107402,1068532,1078076,1071055,1067017,1111290,1073698,1068212,1064345,1116819) ORDER BY field (ArticleID,1091703,1091900,1089263,1102250,1112871,1099985,1080363,1121130,1101394,1078521,1069253,1056440,1062062,1010909,1101442,1096000,1061838,1085388,1086608,1065727,1107402,1068532,1078076,1071055,1067017,1111290,1073698,1068212,1064345,1116819)