如何判断特征向量是否正交

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select * from tbl_Articles WHERE ArticleID=255109 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=255109 LIMIT 0,1
select * from tbl_Articles_sphinx where id=255109 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(698427,1396539,1127027,1828206,2845999,671143,1307354,2080531,1950648,1741807,1065543,1551681,1759763,2142061,2211376,812979,893070,351012,959081,1083030,1900511,2444707,152977,1915120,2136852,1073302,439777,903977,1069935,753068) ORDER BY field (ArticleID,698427,1396539,1127027,1828206,2845999,671143,1307354,2080531,1950648,1741807,1065543,1551681,1759763,2142061,2211376,812979,893070,351012,959081,1083030,1900511,2444707,152977,1915120,2136852,1073302,439777,903977,1069935,753068)