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Storing time-series data, relational or non?
... description, the actual PK is (Device, Metric, DateTime). (Please don't call it TimeStamp, that means something else, but that is a minor issue.) The uniqueness of the row is identified by:
(Device, Metric, DateTime)
The Id column does nothing, it is totally and completely redundant.
A...
What is the difference between an int and a long in C++?
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Some compilers even have flags that allow you to modify the default size of int and long ie force them to 8 or 16 etc. See you compiler documentation for details.
– Martin York
Nov 7 '08 at 17:27
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Objective-C 2.0 Mac和iOS开发实践指南 PDF扫描版 - 文档下载 - 清泛网 - ...
Objective-C 2.0 Mac和iOS开发实践指南 PDF扫描版Objective-C Mac iOS《Objective-C 2.0 Mac和iOS开发实践指南》专门为那些想要学习Objecti Ve-C以便为Mac OS x或iOS编写程序的程序员量身打造。《Objectiv...截图：
《Objective-C 2.0 Mac和iOS开发实践指南...
When should I use mmap for file access?
...rovide at least two ways of accessing files. There's the standard system calls open() , read() , write() , and friends, but there's also the option of using mmap() to map the file into virtual memory.
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List of macOS text editors and code editors [closed]
...for this and found Maudite's question about text editors but they were all for Windows.
39 Answers
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Location Manager Error : (KCLErrorDomain error 0)
...st had this problem. Took me a while to find the solution, which is only loosely related to the previous poster's answer.
Airport (WiFi) must be on for CoreLocation in the iPhone/iPad Simulator to work. I was connected via Ethernet so CL didn't do anything in the Simulator. Turn on Airport in you...
Interface Builder: What are the UIView's Layout iOS 6/7 Deltas for?
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This actually refers to the Delta between layout position from iOS6 to iOS7.
In iOS7, some views can hide the status bar or have it transparent and, in effect, it is overlaid on top of your view. So if you put a UI element at (0.0...
How to change SmartGit's licensing option after 30 days of commercial use on ubuntu?
while installing smartgit 3.0.4 I checked the commercial licensing option, because I was just clicking "next" button : ) (30 day trial and then you have to buy it). Now today is my 31st day of using SG and I can't change my licensing options (reinstalling smartgit doesn't help) and I'm not able to u...
What's the difference between “version number” in iTunes Connect, “bundle version”, “bundle version
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Yes, they are related. They all refer to the version of your application.
iTunes Connect
This is the version number shown in the App Store; This must be a pure version number like 1.2.3
Bundle Version (CFBundleVersion)
This doesn't need to be a pure...
Clean way to launch the web browser from shell script?
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If the user has Python installed... But thanks for mentioning the webbrowser module !
– nicoulaj
Jun 26 '10 at 17:41
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