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SQL JOIN - WHERE clause vs. ON clause

... @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...
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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...
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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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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. ...
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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...
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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. share | ...
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CMake使用教程 - C/C++ - 清泛网 - 专注C/C++及内核技术

...或者ctest)、生成当前平台的安装包(make package)、生成源码包(make package_source)、产生Dashboard显示数据并上传等高级功能,只要在CMakeLists.txt中简单配置,就可以完成很多复杂的功能,包括写测试用例。 如果有嵌套目录,子...
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Android Studio/Intellij Idea: “Table of Contents” for a class

...I have seen. One thing that has been annoying me though is this lack of "Table of Contents" for a class. I apologize for not knowing exactly what to call it. But what I am referring to is the dropdown menu in eclipse that lists all the methods, interfaces, classes and so on that are in that class fi...
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Understanding ibeacon distancing

... basic concept of how distancing with ibeacon (beacon/ Bluetooth-lowenergy/BLE) can work. Is there any true documentation on how far exactly an ibeacon can measure. Lets say I am 300 feet away...is it possible for an ibeacon to detect this? ...
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import module from string variable

... importlib should be avaliable on pypi for < python2.7 – Jeffrey Jose Aug 19 '12 at 12:12 51 ...