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Convert Rows to columns using 'Pivot' in SQL Server
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If you are using SQL Server 2005+, then you can use the PIVOT function to transform the data from rows into columns.
It sounds like you will need to use dynamic sql if the weeks are unknown but it is easier to see the correc...
Shell脚本编程30分钟入门 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...PHP等语言不一样，sh的流程控制不可为空，如：
<?php
if (isset($_GET["q"])) {
search(q);
}
else {
//do nothing
}
在sh/bash里可不能这么写，如果else分支没有语句执行，就不要写这个else。
还要注意，sh里的if [ $foo -eq 0 ]，这个方括...
Tools for JPEG optimization? [closed]
Do you know of any tools (preferrably command-line) to automatically and losslessly optimize JPEGs that I could integrate into our build environment? For PNGs I'm currently using PNGOUT , and it generally saves around 40% bandwidth/image size.
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Any way to replace characters on Swift String?
I am looking for a way to replace characters in a Swift String .
21 Answers
21
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Return None if Dictionary key is not available
I need a way to get a dictionary value if its key exists, or simply return None , if it does not.
11 Answers
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If threads share the same PID, how can they be identified?
...hread's "PID"), and there's where gettid(2) comes in. This way I can tell, if we're in the main thread or not.
– Tomasz Gandor
Nov 21 '14 at 12:40
2
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Cross compile Go on OSX?
...eem to have improved the cross compilation process, meaning it is built in now. No ./make.bash-ing or brew-ing required. The process is described here but for the TLDR-ers (like me) out there: you just set the GOOS and the GOARCH environment variables and run the go build.
For the even lazier copy...
In Django, how does one filter a QuerySet with dynamic field lookups?
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A simplified example:
In a Django survey app, I wanted an HTML select list showing registered users. But because we have 5000 registered users, I needed a way to filter that list based on query criteria (such as just people who co...
Private and Protected Members : C++
Can someone enlighten me as to the difference between private and protected members in classes?
17 Answers
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Structs in Javascript
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The only difference between object literals and constructed objects are the properties inherited from the prototype.
var o = {
'a': 3, 'b': 4,
'doStuff': function() {
alert(this.a + this.b);
}
};
o.doStuff(); // displays: 7
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