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What is Normalisation (or Normalization)?
...ue in a cell. Example:
UserId | Car
---------------------
1 | Toyota
2 | Ford,Cadillac
Here the "Car" column (which is a string) have several values. That offends the first normal form, which says that each cell should have only one value. We can normalize this problem away by have a se...
Bootstrap 3 jquery event for active tab change
...arget);
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/js/bootstrap.min.js"></script>
<link href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap.mi...
App Inventor 2 能否实现后台推送通知？源码级深度调研 - App应用开发 - 清...
背景：微信群用户提问
AI2 能否实现类似 uni-push 的后台推送通知？手机开机不打开 App 就能自动读取云端数据。
以下是源码级深度调研结果。
一、推送通知的工作原理
系统级推送（真推送）
服务器 -> FCM/APNs 云...
Stock ticker symbol lookup API [closed]
...mits you and you have to enter a CAPTCHA. I'm trying to batch-lookup about 2000 ticker symbols. Any ideas?
11 Answers
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When should I use a struct instead of a class?
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297
MSDN has the answer:
Choosing Between Classes and Structures.
Basically, that page gives you ...
How do I get NuGet to install/update all the packages in the packages.config?
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You can use nuget.exe to restore your packages or with NuGet 2.7, or above, installed you can simply compile your solution in Visual Studio, which will also restore the missing packages.
For NuGet.exe you can run the following command for each project.
nuget install packages.config
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Tree view of a directory/folder in Windows? [closed]
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edited Nov 18 '15 at 19:26
Montag
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answered Mar 1 '1...
iPhone : How to detect the end of slider drag?
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answered Feb 22 '12 at 8:08
Rok JarcRok Jarc
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What is the difference between gravity and layout_gravity in Android?
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20 Answers
20
Active
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How do I make a column unique and index it in a Ruby on Rails migration?
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edited Jun 8 at 21:00
answered Sep 19 '09 at 20:39
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