select count(*), sum(p1),vin from tj23 as a where EXISTS(select null from bak1 as b where a.vin = b. ...
SQL:select count ,sum p ,sum p ,vin from tj where inday between sstart and send and type rand.nextInt group by vin order by sum p desc limit 个并发:Thread Thread , ,main gt Mon Nov : : CST Mon Nov : : CS ...
2021-11-08 10:11 0 98 推荐指数:
select count(*), sum(p1),vin from tj23 as a where EXISTS(select null from bak1 as b where a.vin = b. ...
by sum(p1) desc limit 13 ; 从10亿条中每次随机取3000万数据排序: 50个 ...
select inday,sum(p1),count(*) from tj23 as a where inday between '"+sstart+"' and '"+send+"' group by inday limit 150个并发:Thread[Thread-40,5,main ...
SQL:select a.tid,count(*),sum(std_mileage) from kudu_via_city_pdi3 as a where entry_time between "+e ...
1399 git clone https://github.com/VirusTotal/c-vtapi.git 1400 cd c-vtapi/ 1402 sudo apt-get ...
大数据量的查询,不仅查询速度非常慢,而且还会导致数据库经常宕机(刚接到这个项目时候,数据库经常宕机o(╯□╰)o)。 那么,如何处理上亿级的数据量呢?如何从数据库经常宕机到上亿数据秒查?仅以此篇文章作为处理的总结。 数据背景:下面是存放历史数据表的数据量,数据量确实很大,3亿多条。但这也仅仅是 ...
数据准备: 一、基本查询 语法: 查询类型:match_all,match,term,range,fuzzy,bool 等等 查询条件:查询条件会根据类型的不同,写法也有差异 1.1 查询所有(match_all) 查询指令 ...
数据查询 基本查询 方法find():查询 db.集合名称.find({条件文档}) 方法findOne():查询,只返回第一个 db.集合名称.findOne({条件文档}) 方法pretty():将结果格式化 ...