大约有 36,150 项符合查询结果(耗时:0.0409秒) [XML]

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一文了解大数据领域创业的机会与方向 - 大数据 & AI - 清泛网 - 专注C/C++及内核技术

...热门手机游戏的数据,包括用户的设备数据、行为数据、日常数据和游戏里的消费数据等等。根据这些数据,可以对这些游戏用户进行用户画像。 以招行信用卡推广为例,Talkingdata通过大数据分析发现,《刀塔传奇》以及《我...
https://www.tsingfun.com/it/tech/1944.html 

如何建立一套适合自己的高胜算交易系统 - 更多技术 - 清泛网 - 专注C/C++及内核技术

... 建立交易系统总体流程步骤四:“执行交易系统” A) 日常操作主观要服从客观,“交易有依据、欲望要消除”; B) 模拟操作不可少,即使不交易,依然要“仔细看盘、仔细复盘、揣摩多空主力的思路、勤动脑多实践”,最终...
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企业级负载平衡简介 - 更多技术 - 清泛网 - 专注C/C++及内核技术

...不会等到服务器真正过载了才去解决这个问题。在服务的日常运维中,我们在服务器的平均负载和峰值负载达到某个特定阈值时就需要考虑是否需要为相应服务进行扩容。 一旦一个服务使用了负载平衡系统,那么它将在高可用...
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正则表达式 30 分钟入门教程 - 更多技术 - 清泛网 - 专注C/C++及内核技术

...达式。 除了作为入门教程之外,本文还试图成为可以在日常工作中使用的正则表达式语法参考手册。就作者本人的经历来说,这个目标还是完成得不错的——你看,我自己也没能把所有的东西记下来,不是吗? 清除格式 文本...
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构建高并发高可用的电商平台架构实践 - 更多技术 - 清泛网 - 专注C/C++及内核技术

...分析、流控、风险控制等领域。电商平台系统或者应用对日常产生的大量日志和异常信息,需要经过实时过滤、分析,以判定是否需要预警; 同时需要对系统做自我保护机制,比如对模块做流量的控制,以防止非预期的对系统...
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动态追踪(Dynamic Tracing)技术漫谈 - 操作系统(内核) - 清泛网 - 专注C/C++及内核技术

...“花园小径”当中,只见树木,不见森林。 所以,对于日常的开发过程当中的调试,其实我们还是推荐最简单也是看起来最笨的方法,即在关键代码路径上打印输出语句。这样我们通过查看日志等输出得到一个有很完整的上下...
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What is the single most influential book every programmer should read? [closed]

... Code Complete (2nd edition) by Steve McConnell The Pragmatic Programmer Structure and Interpretation of Computer Programs The C Programming Language by Kernighan and Ritchie Introduction to Algorithms by Cormen, Leiserson, Rivest & Stein Design Patt...
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what is the difference between GROUP BY and ORDER BY in sql

... ORDER BY alters the order in which items are returned. GROUP BY will aggregate records by the specified columns which allows you to perform aggregation functions on non-grouped columns (such as SUM, COUNT, AVG, etc). ...
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SQL Server: Difference between PARTITION BY and GROUP BY

I've been using GROUP BY for all types of aggregate queries over the years. Recently, I've been reverse-engineering some code that uses PARTITION BY to perform aggregations. In reading through all the documentation I can find about PARTITION BY , it sounds a lot like GROUP BY , maybe with a ...
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Is it possible to GROUP BY multiple columns using MySQL?

Is it possible to GROUP BY more than one column in a MySQL SELECT query? For example: 7 Answers ...