协方差公式

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select * from tbl_Articles WHERE ArticleID=3020487 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=3020487 LIMIT 0,1
select * from tbl_Articles_sphinx where id=3020487 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1182873,1139655,677680,1052528,2957362,957626,915908,869270,2509845,735677,3151899,1090447,909626,2117223,666407,3193143,3403687,1202441,2000258,4031649,3647485,3173019,462453,538874,1213953,2383662,1782825,573064,1765940,3501325) ORDER BY field (ArticleID,1182873,1139655,677680,1052528,2957362,957626,915908,869270,2509845,735677,3151899,1090447,909626,2117223,666407,3193143,3403687,1202441,2000258,4031649,3647485,3173019,462453,538874,1213953,2383662,1782825,573064,1765940,3501325)