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How to create a unique index on a NULL column?

...f uniques" -- NULL is a special value in SQL (similar in many ways to NaN) and needs to be treated accordingly. It's actually a failure in in SQL Server to honor various SQL specifications: here is a link for a request for the "correct implementation" for what it is worth: connect.microsoft.com/SQLS...
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Why is not in HTML 5 Tag list while is?

... +1. Excellent point about semantics and clearly the best answer so far. – ЯegDwight Feb 14 '10 at 3:30 9 ...
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Why must a nonlinear activation function be used in a backpropagation neural network? [closed]

I've been reading some things on neural networks and I understand the general principle of a single layer neural network. I understand the need for aditional layers, but why are nonlinear activation functions used? ...
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Difference between Ctrl+Shift+F and Ctrl+I in Eclipse

... If you press CTRL + I it will just format tabs/whitespaces in code and pressing CTRL + SHIFT + F format all code that is format tabs/whitespaces and also divide code lines in a way that it is visible without horizontal scroll. ...
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Java 7 language features with Android

Just wondering if anyone has tried using new Java 7 language features with Android? I know that Android reads the bytecode that Java spits out and turns it to dex. So I guess my question is can it understand the bytecode of Java 7? ...
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What is 'Pattern Matching' in functional languages?

I'm reading about functional programming and I've noticed that Pattern Matching is mentioned in many articles as one of the core features of functional languages. ...
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How to select between brackets (or quotes or …) in Vim?

...that I need it, I can't seem to find it (naturally), so I'll just ask nice and simple. 9 Answers ...
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Convert char to int in C and C++

How do I convert a char to an int in C and C++? 12 Answers 12 ...
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How do you attach and detach from Docker's process?

...nal info from this source: docker run -t -i → can be detached with ^P^Qand reattached with docker attach docker run -i → cannot be detached with ^P^Q; will disrupt stdin docker run → cannot be detached with ^P^Q; can SIGKILL client; can reattach with docker attach ...
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How to redirect output of an already running process [duplicate]

Normally I would start a command like 5 Answers 5 ...