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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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What is the difference between “Rollback…” and “Back Out Submitted Changelist #####” in Perforce P4V

I want to reverse the changes from one of my checkins. In the right-click context menu of the particular changelist, there are these two options: ...
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D3.js: what is 'g' in .append(“g”) D3.js code?

I am new to D3.js , started learning today only 2 Answers 2 ...
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How can I quantify difference between two images?

Here's what I would like to do: 22 Answers 22 ...
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Best way to store date/time in mongodb

I've seen using strings, integer timestamps and mongo datetime objects. 2 Answers 2 ...
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Is there a CSS selector by class prefix?

I want to apply a CSS rule to any element whose one of the classes matches specified prefix. 4 Answers ...
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How to prove that a problem is NP complete?

I have problem with scheduling. I need to prove that the problem is NP complete. What can be the methods to prove it NP complete? ...
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How do I use vimdiff to resolve a git merge conflict?

I just merged a branch into my master in git and I got Automatic merge failed; fix conflicts and then commit the result. Now I ran git mergetool and vimdiff opened with the image below. I don't know how to use vimdiff. What does each panel here mean and how should I proceed to fix the merge conf...
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How to add multiple objects to ManyToMany relationship at once in Django ?

Based on the Django doc, I should be able to pass multiple objects at once to be added to a manytomany relationship but I get a ...
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Rails: create on has_one association

Hi (huge Rails newbie here), I have the following models: 4 Answers 4 ...