平面的法向量怎么求

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select * from tbl_Articles WHERE ArticleID=1888076 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=1888076 LIMIT 0,1
select * from tbl_Articles_sphinx where id=1888076 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1042516,1056384,1086230,1068388,1069045,1084139,1077100,1065739,1098219,1064977,1090663,1091952,1111930,1095520,1064819,1069331,1093479,1072006,1048810,1057064,1091908,1016441,1084471,1086095,1056734,1090048,1075760,1088822,1090108,1116293) ORDER BY field (ArticleID,1042516,1056384,1086230,1068388,1069045,1084139,1077100,1065739,1098219,1064977,1090663,1091952,1111930,1095520,1064819,1069331,1093479,1072006,1048810,1057064,1091908,1016441,1084471,1086095,1056734,1090048,1075760,1088822,1090108,1116293)