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Real life example, when to use OUTER / CROSS APPLY in SQL
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T-SQL CASE Clause: How to specify WHEN NULL
...son will be UNKNOWN, which is treated like false in a case structure. See: https://www.xaprb.com/blog/2006/05/18/why-null-never-compares-false-to-anything-in-sql/
To avoid this, Coalesce is the best way.
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What are copy elision and return value optimization?
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Simplest way to read json from a URL in java
...throws IOException, JSONException {
JSONObject json = readJsonFromUrl("https://graph.facebook.com/19292868552");
System.out.println(json.toString());
System.out.println(json.get("id"));
}
}
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Git and nasty “error: cannot lock existing info/refs fatal”
...
You want to try doing:
git gc --prune=now
See https://www.kernel.org/pub/software/scm/git/docs/git-gc.html
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What is the purpose of python's inner classes?
...e coupling for some of those helper classes. For example, when I implement https://stackoverflow.com/a/8274307/2718295
:utils.py:
import json, decimal
class Helper1(object):
pass
class Helper2(object):
pass
# Here is the notorious JSONEncoder extension to serialize Decimals to JSON floa...
Chrome, Javascript, window.open in new tab
...nt (Chrome 39) I use this code to open a new tab:
window.open('http://www.stackoverflow.com', '_blank', 'toolbar=yes, location=yes, status=yes, menubar=yes, scrollbars=yes');
Of course this may change in future versions of Chrome.
It is a bad idea to use this if you can't control the br...
Disable cache for some images
... javascript, here is an example...
<img id=graph alt=""
src="http://www.kitco.com/images/live/gold.gif"
/>
<script language="javascript" type="text/javascript">
var d = new Date();
document.getElementById("graph").src =
"http://www.kitco.com/images/live/gold.gif?v...
Is there a Wikipedia API?
...box templates
Here is a quick example how it could be done in .NET http://www.kozlenko.info/blog/2010/07/20/executing-sparql-query-on-wikipedia-in-net/
There are some SPARQL libraries available for multiple platforms to make queries easier
...
Vim multiline editing like in sublimetext?
...rovide multiple cursors like Sublime.
I think this one looks promising:
https://github.com/terryma/vim-multiple-cursors
It seemed abandoned for a while, but has had some contributions in 2014.
It is quite powerful, although it took me a little while to get used to the flow (which is quite Subl...