椭圆内法线方向怎么求

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select * from tbl_Articles WHERE ArticleID=1367537 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=1367537 LIMIT 0,1
select * from tbl_Articles_sphinx where id=1367537 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1121102,1063147,1088484,1499493,1049542,1131985,1096603,1045005,1065131,1594630,1106882,1096711,1131625,960752,1047881,1097743,1079219,1121218,1130394,1493313,1131263,1067025,1066160,1122104,1072655,1078358,1068080,1046100,1129287,2223504) ORDER BY field (ArticleID,1121102,1063147,1088484,1499493,1049542,1131985,1096603,1045005,1065131,1594630,1106882,1096711,1131625,960752,1047881,1097743,1079219,1121218,1130394,1493313,1131263,1067025,1066160,1122104,1072655,1078358,1068080,1046100,1129287,2223504)