如何计算平面的法向量

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select * from tbl_Articles WHERE ArticleID=2050978 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=2050978 LIMIT 0,1
select * from tbl_Articles_sphinx where id=2050978 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1103287,1103700,1044745,1080086,1073088,1066888,1094393,1086582,1051535,1063309,1065237,1103348,1070292,1070284,1046512,1072278,1090541,1054388,1055678,1077960,1101929,1096338,1048360,1102022,1112917,1061242,1078725,1095700,1001707,1102156) ORDER BY field (ArticleID,1103287,1103700,1044745,1080086,1073088,1066888,1094393,1086582,1051535,1063309,1065237,1103348,1070292,1070284,1046512,1072278,1090541,1054388,1055678,1077960,1101929,1096338,1048360,1102022,1112917,1061242,1078725,1095700,1001707,1102156)