方差如何计算

页面:/news/view-3166889/ | 耗时:0.7093 s | 内存:1.89 MB | 查询:4 | 缓存读取:4 写入:0 | 加载文件:23
select * from tbl_Articles WHERE ArticleID=3166889 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=3166889 LIMIT 0,1
select * from tbl_Articles_sphinx where id=3166889 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(270482,1304934,1067729,540141,1130162,2719435,1841268,2256018,1480713,215227,649923,430555,980285,636254,2149189,2436529,917776,2475950,161083,2476771,222782,758750,1132159,1074204,1557365,448274,349914,3282486,2052880,1517652) ORDER BY field (ArticleID,270482,1304934,1067729,540141,1130162,2719435,1841268,2256018,1480713,215227,649923,430555,980285,636254,2149189,2436529,917776,2475950,161083,2476771,222782,758750,1132159,1074204,1557365,448274,349914,3282486,2052880,1517652)