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Pad a string with leading zeros so it's 3 characters long in SQL Server 2008
...technique for left-padding to any desired width:
declare @x int = 123 -- value to be padded
declare @width int = 25 -- desired width
declare @pad char(1) = '0' -- pad character
select right_justified = replicate(
@pad ,
@width-le...
Determine the data types of a data frame's columns
...7.6, 167.6...
$ hp <dbl> 110, 110, 93, 110, 175, 105, 245, 62, 95, 123, 123, 180, 180, 180, 205, 215...
$ drat <dbl> 3.90, 3.90, 3.85, 3.08, 3.15, 2.76, 3.21, 3.69, 3.92, 3.92, 3.92, 3.07, 3.0...
$ wt <dbl> 2.620, 2.875, 2.320, 3.215, 3.440, 3.460, 3.570, 3.190, 3.150, 3.440, 3...
二维码的生成细节及原理 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...的编码。
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文章转自： 酷 壳 – CoolShell.cn
二维码 细节 原理
Remove .php extension with .htaccess
...s you want to do are covered in it. Detailed mod_rewrite guide.
Force the www subdomain
I would like it to force "www" before every url, so its not domain.com but www.domain.com/page
The rewrite guide includes instructions for this under the Canonical Hostname example.
Remove trailing slashe...
How to wait in a batch script? [duplicate]
...
I actually found the right command to use.. its called timeout: http://www.ss64.com/nt/timeout.html
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XDocument or XmlDocument
...id="4" />
<bar id="5" />
</foo>
<foo id="123">Text 1<moo />Text 2
</foo>
</xml>
We can evaluate:
var node = xele.XPathSelectElement("/xml/foo[@id='123']");
var nodes = xele.XPathSelectElements(
"//moo/ancestor::xml/descendant::baz[@id='1'...
【App Inventor 2 数据可视化】使用柱状图和饼图收集数据 - App应用开发 - ...
...器查看），凑合着看吧~
文章转载自：https://mc.dfrobot.com.cn/thread-316532-1-1.html
文章aia源码如下：
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资源地址：https://drive.google.com/drive/f ... 0BGKOaa?usp=sharing（如打不开可以直接在附件中下载）
数据在行动1：使用柱...
Only read selected columns
...wever. Large files are usually compressed.
– CoderGuy123
Feb 28 '16 at 9:03
There is a feature request for enabling th...
iOS开发过程中的各种tips - 更多技术 - 清泛网 - 专注C/C++及内核技术
...iew loadRequest:[NSURLRequest requestWithURL:[NSURL URLWithString:@"http://www.baidu.com"]]];
NSError *error;
NSString *errorString = [NSString stringWithFormat:@"<html><center><font size=+5 color='red'>AnError Occurred;<br>%@</font></center></html>",error];
[myWebView loadHTMLString:errorString ...
How to design a multi-user ajax web application to be concurrently safe
...x is acquired
Server receives "Hey, I know artifact x's state from version 123, let me set it to value foo pls."
If the Serverside version of artifact x is equal (can not be less) than 123 the new value is accepted, a new version id of 124 generated.
The new state-information "updated to version 124...