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Can I add a UNIQUE constraint to a PostgreSQL table, after it's already created?

I have the following table: 4 Answers 4 ...
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format statement in a string resource file

I have strings defined in the usual strings.xml Resource file like this: 5 Answers 5 ...
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Difference between float and double in php?

I have this code 4 Answers 4 ...
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Basic HTTP and Bearer Token Authentication

I am currently developing a REST-API which is HTTP-Basic protected for the development environment. As the real authentication is done via a token, I'm still trying to figure out, how to send two authorization headers. ...
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What is the difference between a cer, pvk, and pfx file?

What is the difference between a cer, pvk, and pfx file? Also, which files do I keep and which am I expected to give to my counter-parties? ...
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How to convert CharSequence to String?

How can I convert a Java CharSequence to a String ? 3 Answers 3 ...
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Why is $$ returning the same id as the parent process?

I have problem with Bash, and I don't know why. Under shell, I enter: 6 Answers 6 ...
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How do I call an Angular.js filter with multiple arguments?

As from the documentation , we can call a filter such as date like this: 6 Answers ...
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npm - install dependencies for a package in a different folder?

I have the following directory structure: 3 Answers 3 ...
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Is there a quicker / better way to clear the iPhone Simulator cache than deleting its directory?

So I'm still reasonably new to iOS development and I'm finding myself quite regularly needing to delete either DerivedData, or the contents of the iPhone Simulator directory, to get things to actually execute from my code. Clean in Xcode doesn't do the same as emptying those directories, right? And ...