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Linq to Entities join vs groupjoin

I have web searched but I still cant find a simple answer. Can someone please explain (in simple English) what a GroupJoin is? How is it different from a regular inner Join ? Is it commonly used? Is it only for method syntax? What about query syntax? A c# code example would be nice. ...
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Why does the order of the loops affect performance when iterating over a 2D array?

Below are two programs that are almost identical except that I switched the i and j variables around. They both run in different amounts of time. Could someone explain why this happens? ...
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What exactly is a reentrant function?

Most of the times , the definition of reentrance is quoted from Wikipedia : 7 Answers ...
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Check if page gets reloaded or refreshed in JavaScript

I want to check when someone tries to refresh a page. 10 Answers 10 ...
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How is the “greater than” or “>” character used in CSS?

...number of times in CSS files but I have no idea how its used. Can anyone explain it to me and show how they are useful in making a page style easier? ...
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simulate background-size:cover on or

... This is something I pulled my hair out over for a while, but I came across a great solution that doesn't use any script, and can achieve a perfect cover simulation on video with 5 lines of CSS (9 if you count selectors and brackets). This has 0 ...
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What is “entropy and information gain”?

I am reading this book ( NLTK ) and it is confusing. Entropy is defined as : 7 Answers ...
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Filtering collections in C#

... collection in C#. I am currently using generic List collections, but am open to using other structures if they perform better. ...
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Is it possible to apply CSS to half of a character?

... Now on GitHub as a Plugin! Feel free to fork and improve. Demo | Download Zip | Half-Style.com (Redirects to GitHub) Pure CSS for a Single Character JavaScript used for automation across text or multiple characters Preserves Text Accessi...
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How to export a mysql database using Command Prompt?

I have a database that is quite large so I want to export it using Command Prompt but I don't know how to. 16 Answers ...