方差是什么怎么求

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select * from tbl_Articles WHERE ArticleID=321367 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=321367 LIMIT 0,1
select * from tbl_Articles_sphinx where id=321367 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1077268,1123341,1098277,1062670,1117299,1063619,999794,1102298,1068154,1072809,1069253,1073568,1081247,1118881,1127143,1063165,1083113,1093152,1099203,1071992,1117574,1090310,1067617,1084287,1058085,1074532,1061928,1051917,1117896,980715) ORDER BY field (ArticleID,1077268,1123341,1098277,1062670,1117299,1063619,999794,1102298,1068154,1072809,1069253,1073568,1081247,1118881,1127143,1063165,1083113,1093152,1099203,1071992,1117574,1090310,1067617,1084287,1058085,1074532,1061928,1051917,1117896,980715)