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Why does Git tell me “No such remote 'origin'” when I try to push to origin?

I am very new to Git; I only recently created a GitHub account. 3 Answers 3 ...
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In MySQL queries, why use join instead of where?

It seems like to combine two or more tables, we can either use join or where. What are the advantages of one over the other? ...
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Postgres: “ERROR: cached plan must not change result type

This exception is being thrown by the PostgreSQL 8.3.7 server to my application. Does anyone know what this error means and what I can do about it? ...
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How to stop a JavaScript for loop?

I'm using this JavaScript to iterate through an array and find a matching array element: 4 Answers ...
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Does Java casting introduce overhead? Why?

Is there any overhead when we cast objects of one type to another? Or the compiler just resolves everything and there is no cost at run time? ...
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Why and not taking font-family and font-size from body?

Why Textarea and textfield not taking font-family and font-size from body? 5 Answers ...
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What is the difference between Fragment and FragmentActivity?

My question is apart from the obvious inheritance differences, what are the main differences between Fragment and FragmentActivity ? To what scenarios are each class best suited? I'm trying to get an understanding of why both of these classes exist... ...
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What is the difference between Unidirectional and Bidirectional JPA and Hibernate associations?

What is the difference between Unidirectional and Bidirectional associations? 4 Answers ...
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How to make a promise from setTimeout

This is not a realworld problem, I'm just trying to understand how promises are created. 2 Answers ...
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MongoDB atomic “findOrCreate”: findOne, insert if nonexistent, but do not update

as the title says, I want to perform a find (one) for a document, by _id, and if doesn't exist, have it created, then whether it was found or was created, have it returned in the callback. ...