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Rails :include vs. :joins

...oins => users to pull in all the user information for sorting purposes, etc it will work fine and take less time than :include, but say you want to display the comment along with the users name, email, etc. To get the information using :joins, it will have to make separate SQL queries for each u...
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“hello, world” 起源及其他 - 创意 - 清泛网 - 专注C/C++及内核技术

“hello, world” 起源及其他学过编程语言人都笑了,在程序员心目中,hello world是一切开始,程序语言教科书第一个演示程序、WordPress第一篇示例文章(我hello world)、环境搭建成功后第一个测试… 问题提出 相传...
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卖来卖去盛大游戏真悲哀 - 资讯 - 清泛网 - 专注C/C++及内核技术

卖来卖去盛大游戏真悲哀冗长肥皂剧有人喜欢有人不喜欢,但不应该发生在科技领域,毕竟这个市场日新月异,稍不留神就容易被对手打击得万劫不复。盛大游戏私有化 冗长肥皂剧有人喜欢有人不喜欢,但不应该发生在...
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英特尔与14家车企合作 研发远程控车技术 - 资讯 - 清泛网 - 专注C/C++及内核技术

...进军汽车市场时,英特尔也加大了关于汽车行业创新研发力度。近日,网通社从英特尔中国区总经理Rupal Shah处了解到,...在谷歌、诺基亚纷纷进军汽车市场时,英特尔也加大了关于汽车行业创新研发力度。近日,网通社从...
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当当网第三季度净亏损2810万元 同比由盈转亏 - 资讯 - 清泛网 - 专注C/C++及内核技术

...比由盈转亏11月25日消息,当当网发布了截至2015年9月30日2015财年第三季度未审计财报。财报显示,当当网第三季度总净营收为23.719亿元人民币(约合3.732亿美元),同比增长22.6%;净亏损为2810万元人民币(约合440万美元),去年同期...
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访问图像和声音 · App Inventor 2 中文网

... « 返回首页 使用 App Inventor 构建应用程序可以从三种不同位置访问声音、图像和视频源: 应用程序资产 “界面设计”视图中显示标记为 媒体 源(应用程序 assets 一部分)与应用程...
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Which is faster : if (bool) or if(int)?

...ngs like sign-extend to bring it to certain widths to put it on the stack, etc. (You can't push a byte.) When the optimizer views the AST and does its magic, however, it looks at surrounding context and "knows" when it can replace code with something more efficient without changing semantics. So ...
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Python - Create a list with initial capacity

...to 300x slower than other languages due to Python features like decorators etc (https://wiki.python.org/moin/PythonSpeed/PerformanceTips#Data_Aggregation#Data_Aggregation). share | improve this answ...
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How to get current CPU and RAM usage in Python?

...d way of getting current system status (current CPU, RAM, free disk space, etc.) in Python? Bonus points for *nix and Windows platforms. ...
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C++形参与实参区别(实例解析) - C/C++ - 清泛网 - 专注C/C++及内核技术

C++形参与实参区别(实例解析)本文以实例阐述了C++中形参与实参区别,有助于读者加深对于C++形参与实参认识。形参出现在函数定义中,在整个函数体内都可以使用, 离...本文以实例阐述了C++中形参与实参区别,有...