协方差计算公式

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select * from tbl_Articles WHERE ArticleID=577875 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=577875 LIMIT 0,1
select * from tbl_Articles_sphinx where id=577875 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1473738,3368026,3511840,2492864,3492149,3229035,3408201,463049,1160427,2689676,1371240,1321785,473147,3981661,591266,495493,3241543,2826446,2081769,1153544,3072214,601280,1079543,721233,1050688,2160019,841946,559794,697732,2403968) ORDER BY field (ArticleID,1473738,3368026,3511840,2492864,3492149,3229035,3408201,463049,1160427,2689676,1371240,1321785,473147,3981661,591266,495493,3241543,2826446,2081769,1153544,3072214,601280,1079543,721233,1050688,2160019,841946,559794,697732,2403968)