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SQL JOIN - WHERE clause vs. ON clause
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@JamesHutchison It's tough to make reliable performance generalizations based on observed behaviors like this. What was true one day tends to be wrong the next, because this is an implementation detail rather than documented behavior. Database teams are always look...
How to check for an active Internet connection on iOS or macOS?
...y via closures
let reachability = Reachability()!
reachability.whenReachable = { reachability in
if reachability.connection == .wifi {
print("Reachable via WiFi")
} else {
print("Reachable via Cellular")
}
}
reachability.whenUnreachable = { _ in
print("Not reachabl...
【精心整理】【实用】visual C++中最常用的类与API函数 - C/C++ - 清泛网 -...
...框，为FALSE时构造另存为对话框；
lpszDefExt指定缺省文件扩展名，在对话框弹出后，若没有在文件名框中输入扩展名，则自动附加指定的扩展名，若lpszDefExt为NULL，则不附加扩展名；
lpszFileName指定出现在文件名框中的初始文件名...
How to iterate through a DataTable
I need to iterate through a DataTable . I have an column there named ImagePath .
4 Answers
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技术人员如何创业《四》- 打造超强执行力团队 - 资讯 - 清泛网 - 专注C/C++...
...多产品刚开始只有一个人后续也会发展团队来完成产品的扩展，本篇文章主要讲的也是需要多人协助才能达到目标的创业方式。
1、如何组建合伙人团队？参考前面 技术人员如何创业《二》- 合伙人的模式、 技术人员如何...
从源代码剖析Mahout推荐引擎 - 大数据 & AI - 清泛网 - 专注C/C++及内核技术
...是等间距的数据。Mahout中，为皮尔森相关计算提供了一个扩展，通过增加一个枚举类型 （Weighting）的参数来使得重叠数也成为计算相似度的影响因子。
UncenteredCosineSimilarity: 余弦相似度
原理：多维空间两点与所设定的点形...
C++并发编程（中文版） - 文档下载 - 清泛网 - 专注C/C++及内核技术
...内存模型和原子操作、基于锁和无锁数据结构的构建，再扩展到并行算法、线程管理，最后还介绍了多线程代码的测试工作。
本书的附录部分还对C++11新语言特性中与多线程相关的项目进行了简要的介绍，并提供了C++11线程库的...
Easiest way to detect Internet connection on iOS?
...through HTTPUrlConnection instantly fail if there is no connection available. This seems like completely sane behavior, and I was surprised to find NSURLConnection in iOS did not emulate it.
...
How to use android emulator for testing bluetooth application?
...er settings of the virtual machine, Goto serialports -> Port 1 check Enable serial port select a port number
then select port mode as disconnected click ok. now, start virtual
machine. Under Devices -> USB Devices -> you can find your laptop
bluetooth listed. You can simply check t...
What is the appropriate HTTP status code response for a general unsuccessful request (not an error)?
...ul response and serve it to
subsequent clients even when clients may be able to make a successful
request.
I'll leave it to you to decide between 4xx and 5xx, but you should use an error status code.
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