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How do I find duplicates across multiple columns?

So I want to do something like this sql code below: 7 Answers 7 ...
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getSupportActionBar from inside of Fragment ActionBarCompat

I'm starting a new project that uses the AppCompat/ActionBarCompat in v7 support library. I'm trying to figure out how to use the getSupportActionBar from within a fragment. My activity that hosts the fragment extends ActionBarActivity , but I don't see a similar support class for Fragments. ...
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Custom numeric format string to always display the sign

Is there any way I can specify a standard or custom numeric format string to always output the sign, be it +ve or -ve (although what it should do for zero, I'm not sure!) ...
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PostgreSQL naming conventions

Where can I find a detailed manual about PostgreSQL naming conventions? (table names vs. camel case, sequences, primary keys, constraints, indexes, etc...) ...
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How do I script a “yes” response for installing programs?

I work with Amazon Linux instances and I have a couple scripts to populate data and install all the programs I work with, but a couple of the programs ask: ...
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Specify width in *characters*

When using a fixed width font , I'd like to specify the width of an HTML element in characters . 2 Answers ...
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How do I setup a SSL certificate for an express.js server?

Before, in an older version of express, I could do this: 3 Answers 3 ...
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Convert list to tuple in Python

I'm trying to convert a list to a tuple. 6 Answers 6 ...
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How to delete a word and go into insert mode in Vim?

In normal mode I can hit Ctrl + E which deletes the rest of the current word and goes to insert mode. 5 Answers ...
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How to create a colored 1x1 UIImage on the iPhone dynamically?

I would like to create a 1x1 UIImage dynamically based on a UIColor. 6 Answers 6 ...