如何认识统计总体和样本

页面:/news/view-326553/ | 耗时:0.0374 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=326553 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=326553 LIMIT 0,1
select * from tbl_Articles_sphinx where id=326553 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1066925,1083473,1132649,447344,1475856,2745084,2942464,1079426,1119510,1115695,295364,1131307,1078615,569974,374434,1065299,2362519,1127529,336752,1118268,2890592,1519018,1129683,1398011,2681237,1129539,1076936,1129181,1668028,1060911) ORDER BY field (ArticleID,1066925,1083473,1132649,447344,1475856,2745084,2942464,1079426,1119510,1115695,295364,1131307,1078615,569974,374434,1065299,2362519,1127529,336752,1118268,2890592,1519018,1129683,1398011,2681237,1129539,1076936,1129181,1668028,1060911)