外法线方向怎么求

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select * from tbl_Articles WHERE ArticleID=605177 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=605177 LIMIT 0,1
select * from tbl_Articles_sphinx where id=605177 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1093485,1101157,1130666,1086230,1060721,1297897,2563244,1054306,1123120,1089626,1076916,1086804,1056274,1124281,1065087,1087157,1078873,1044845,1125506,1127461,1043987,1071807,1125099,1097061,1125584,1410196,1127551,1132613,1065765,1062692) ORDER BY field (ArticleID,1093485,1101157,1130666,1086230,1060721,1297897,2563244,1054306,1123120,1089626,1076916,1086804,1056274,1124281,1065087,1087157,1078873,1044845,1125506,1127461,1043987,1071807,1125099,1097061,1125584,1410196,1127551,1132613,1065765,1062692)