什么是均方相对误差

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select * from tbl_Articles WHERE ArticleID=357775 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=357775 LIMIT 0,1
select * from tbl_Articles_sphinx where id=357775 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1118543,1077984,1120372,1082261,1073218,1077976,1096120,1069027,1084303,983962,1073588,1103070,998502,1112871,1043355,1115821,1045643,1097147,1493289,1078797,1087862,1048474,1049170,1076187,1113810,1071259,1084083,1078076,1062138,1086354) ORDER BY field (ArticleID,1118543,1077984,1120372,1082261,1073218,1077976,1096120,1069027,1084303,983962,1073588,1103070,998502,1112871,1043355,1115821,1045643,1097147,1493289,1078797,1087862,1048474,1049170,1076187,1113810,1071259,1084083,1078076,1062138,1086354)