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How can I define a composite primary key in SQL?
... (from that table). If a primary key consists of two or more columns it is called a composite primary key. It is defined as follows:
CREATE TABLE voting (
QuestionID NUMERIC,
MemberID NUMERIC,
PRIMARY KEY (QuestionID, MemberID)
);
The pair (QuestionID,MemberID) must then be unique for the t...
When should I use nil and NULL in Objective-C?
...ly, they are exactly equal, you can send messages to both nil and to NULL. Idiomatically though nil is usually used to represent an object
– cobbal
Oct 14 '09 at 5:43
41
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Delaying AngularJS route change until model loaded to prevent flicker
...
$routeProvider resolve property allows delaying of route change until data is loaded.
First define a route with resolve attribute like this.
angular.module('phonecat', ['phonecatFilters', 'phonecatServices', 'phonecatDirectives']).
...
jQuery empty() vs remove()
...ifference between empty() and remove() methods in jQuery , and when we call any of these methods, the objects being created will be destroyed and memory released?
...
gradle build fails on lint task
I have a simple android project that I created with Android Studio 0.4.0.
I use Gradle 1.9 and Gradle Android Plugin 0.7. Yesterday I've added Jake Wharton's ButterKnife library in my gradle build script:
...
How to detect online/offline event cross-browser?
..., and Firefox (since version 41) will detect when you go "offline" automatically - meaning that "online" events and properties will fire automatically when you unplug your network cable.
Mozilla Firefox (before version 41), Opera, and IE take a different approach, and consider you "online" unless yo...
Running a cron job at 2:30 AM everyday
...function_name
The first part is for setting cron job and the next part to call your function.
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How does this checkbox recaptcha work and how can I use it?
...And I also found this: http://jaswsinc.com/recaptcha-ads/ Apparently they did an invite-only beta of their "no CAPTCHA reCAPTCHA" So.... You probably won't be able to make it work on your site, yet. I can't find any information on opting into the beta, but if you search for "No CAPTCHA reCAPTCHA bet...
C#操作XML小结 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...odes[i]);
//为指定节点的新建属性并赋值
node.SetAttribute("id","11111");
//为指定节点添加子节点
root.AppendChild(node);
//获取指定节点的指定属性值
string id=node.Attributes["id"].Value;
//获取指定节点中的文本
string content=node.InnerText;
...
Installing Apple's Network Link Conditioner Tool
...erences.
For versions older than Xcode 8, the package to be downloaded is called Hardware IO Tools for Xcode. Get it from this page
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