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Oracle Differences between NVL and Coalesce
... select null as a from dual
) ;
succeeds.
More information : http://www.plsqlinformation.com/2016/04/difference-between-nvl-and-coalesce-in-oracle.html
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Is git's semi-secret empty tree object reliable, and why is there not a symbolic name for it?
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I wrote up a blog post with two different ways of finding the hash: http://colinschimmelfing.com/blog/gits-empty-tree/
If it were to ever change for some reason, you could use the two ways below to find it. However, I would feel pretty confident using the hash in .bashrc aliases, etc., and I...
Difference between break and continue in PHP?
...sing structures are to be broken out of.
Check out the following links:
http://www.php.net/manual/en/control-structures.break.php
http://www.php.net/manual/en/control-structures.continue.php
Hope it helps..
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Checking if a key exists in a JavaScript object?
...mechanism in Javascript (similar to Java reflection in the Java language).
http://www.ecma-international.org/ecma-262/5.1/#sec-8.10
The Property Descriptor type is used to explain the manipulation and reification of named property attributes. Values of the Property Descriptor type are records compo...
When do you use map vs flatMap in RxJava?
... type T
FlatMap returns an Observable.
A clear example can be seen here: http://blog.couchbase.com/why-couchbase-chose-rxjava-new-java-sdk .
Couchbase Java 2.X Client uses Rx to provide asynchronous calls in a convenient way. Since it uses Rx, it has the methods map and FlatMap, the explanation i...
How to configure git bash command line completion?
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i had same issue, followed below steps:
curl https://raw.githubusercontent.com/git/git/master/contrib/completion/git-completion.bash -o ~/.git-completion.bash
then add the following lines to your .bash_profile (generally under your home folder)
if [ -f ~/.git-complet...
How to get JQuery.trigger('click'); to initiate a mouse click
...esn't work on some elements in Safari. You will need to use a workaround.
http://api.jquery.com/click/
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Automapper - how to map to constructor parameters instead of property setters
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The best practice is to use documented approaches from AutoMapper
http://docs.automapper.org/en/stable/Construction.html
public class SourceDto
{
public SourceDto(int valueParamSomeOtherName)
{
Value = valueParamSomeOtherName;
}
public int Value...
Can you connect to Amazon ElastiСache Redis outside of Amazon?
... a VPC, is never
allowed to be accessed from the Internet.
From here: http://aws.amazon.com/elasticache/faqs/#Can_I_access_Amazon_ElastiCache_from_outside_AWS
EDIT 2018: This answer above was accurate when written, however it is now possible with some configuation to access redis cache from ou...
Express.js: how to get remote client address
... request was originally from in a proprietary fashion (for example, custom http header). In such case, this answer would not work. There may be a custom way to get that information out, but you need to first understand the mechanism.
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