协方差矩阵怎么求

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select * from tbl_Articles WHERE ArticleID=1797699 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=1797699 LIMIT 0,1
select * from tbl_Articles_sphinx where id=1797699 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1057491,1070480,1104127,602304,1044845,1076523,216875,1122088,1078737,1103923,1132597,3182991,1055602,1108612,1044149,1098071,1484894,1112336,1055055,1060531,1125255,1128579,1108293,1075600,1088484,1049542,1370195,960752,1108762,1088822) ORDER BY field (ArticleID,1057491,1070480,1104127,602304,1044845,1076523,216875,1122088,1078737,1103923,1132597,3182991,1055602,1108612,1044149,1098071,1484894,1112336,1055055,1060531,1125255,1128579,1108293,1075600,1088484,1049542,1370195,960752,1108762,1088822)