如何计算标准差系数

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select * from tbl_Articles WHERE ArticleID=2098206 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=2098206 LIMIT 0,1
select * from tbl_Articles_sphinx where id=2098206 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(2483463,2075053,298328,2376304,2805596,2327210,1946890,2079679,1057641,714835,1907440,1082822,1101193,302129,1097693,2531497,1828735,537783,1494983,1964259,1950535,1414512,2050978,2509664,623883,844521,1412793,2205323,251566,1078114) ORDER BY field (ArticleID,2483463,2075053,298328,2376304,2805596,2327210,1946890,2079679,1057641,714835,1907440,1082822,1101193,302129,1097693,2531497,1828735,537783,1494983,1964259,1950535,1414512,2050978,2509664,623883,844521,1412793,2205323,251566,1078114)