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MySQL Results as comma separated list
...roup concat() you can use just concat()
Select concat(Col1, ',', Col2) as Foo_Bar from Table1;
edit this only works in mySQL; Oracle concat only accepts two arguments. In oracle you can use something like select col1||','||col2||','||col3 as foobar from table1;
in sql server you would use + inst...
LINGO使用指南 - 更多技术 - 清泛网 - 专注C/C++及内核技术
LINGO使用指南LINGO使用指南LINGO是用来求解线性和非线性优化问题的简易工具。LINGO内置了一种建立最优化模型的语言，可以简便地表达大规模问题，利用LIN...
LINGO是用来求解线性和非线性优化问题的简易工具。LINGO内置了一种建...
C# Interfaces. Implicit implementation versus Explicit implementation
... : IEnumerable<string>
{
private string[] _list = new string[] {"foo", "bar", "baz"};
// ...
#region IEnumerable<string> Members
public IEnumerator<string> GetEnumerator()
{
foreach (string s in _list)
{ yield return s; }
}
#endregion
...
Unit tests vs Functional tests
... means, generally, that you are testing system functionality -- when I run foo file.txt at the command line, the lines in file.txt become reversed, perhaps. In contrast, a single unit test generally covers a single case of a single method -- length("hello") should return 5, and length("hi") should ...
Ways to circumvent the same-origin policy
...events properly via postMessage:
<script>window.parent.postMessage('foo','*')</script>
Any window may access this method on any other window, at any time, regardless of the location of the document in the window, to send it a message. Consequently, any event listener used to receive m...
Interface vs Base class
...additional features of a class. I'd call it an "is" relationship, like in "Foo is disposable", hence the IDisposable interface in C#.
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'this' vs $scope in AngularJS controllers
...n instance (this) of MyCtrl on the scope for use in the template via {{ MC.foo }}
– William B
Nov 25 '16 at 18:07
What do linkers do?
I've always wondered. I know that compilers convert the code you write into binaries but what do linkers do? They've always been a mystery to me.
...
Android - how do I investigate an ANR?
...find "waiting to lock"
example : waiting to lock <0xblahblah> (a com.foo.A) held by threadid=74
You can notice that "tid=74" hold a task now. So go to tid=74
tid=74 maybe SUSPENDED state! find main reason!
trace does not always contain "waiting to lock". in this case it is hard to find main...
Oracle 11.2.0.4 RAC FOR redhat 6.4 - 数据库(内核) - 清泛网 - 专注C/C++及内核技术
Oracle 11.2.0.4 RAC FOR redhat 6.41、安装REDHAT 6.41.1语言选择 中文 键盘布局 美国英语磁盘选择，我第一次安装忘了把磁盘柜断开了，断开再次安装，没有这个选项了选着...1、安装REDHAT 6.4
1.1语言选择 中文 键盘布局 美国英语
磁盘...