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What is the difference between “INNER JOIN” and “OUTER JOIN”?
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Assuming you're joining on columns with no duplicates, which is a very common case:
An inner join of A and B gives the result of A intersect B, i.e. the inner part of a Venn diagram intersection.
An outer join of A and B gives the results of A union B, i.e. the outer parts of a Venn diagram un...
How to check if a query string value is present via JavaScript?
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Sending Email in Android using JavaMail API without using the default/built-in app
... * the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY ...
Determine project root from a running node.js application
...nt globally installed modules (for example, if your app is running in /var/www/ but the module is installed in ~/.nvm/v0.x.x/lib/node/). It won't work 100% of the time, but it's going to work in most common scenarios.
Pros & Cons
Works without configuration in most circumstances. Also provid...
Best way to iterate through a Perl array
...be used? If so, sounds like one shouldn't use that approach. stackoverflow.com/questions/6440723/… rt.cpan.org/Public/Bug/Display.html?id=115863
– Thorsten Schöning
Jan 14 '19 at 11:40
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PHP - concatenate or directly insert variables in string
...cations, those won't matter 1.
As a sidenote, so my answer is a bit more complete: the day you'll want to do something like this:
echo "Welcome $names!";
PHP will interpret your code as if you were trying to use the $names variable -- which doesn't exist.
- note that it will only work if you us...
What is the most appropriate way to store user settings in Android application
...Preferences are your best bet for storing preferences, so in general I'd recommend that approach for saving application and user settings.
The only area of concern here is what you're saving. Passwords are always a tricky thing to store, and I'd be particularly wary of storing them as clear text. T...
What is Virtual DOM?
...ouching the real DOM or going through the DOM API. Then, when it renders a component, it uses this virtual DOM to figure out what it needs to do with the real DOM to get the two trees to match.
You can think of the virtual DOM like a blueprint. It contains all the details needed to construct the DO...
How do I create a simple 'Hello World' module in Magento?
... look like this:
<?xml version="1.0"?> <config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:Module/etc/module.xsd"> <module name="Cloudways_Mymodule" setup_version="1.0.0"></module> </config>
Registration ...
How can I check if a background image is loaded?
...g with it's event listener:
Short version:
const imageUrl = "https://www.google.com/images/branding/googlelogo/1x/googlelogo_color_272x92dp.png";
let bgElement = document.querySelector("body");
let preloaderImg = document.createElement("img");
preloaderImg.src = imageUrl;
preloaderImg.ad...