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Build.scala, % and %% symbols meaning

I'm new to Play! Framework 2.1 (java version) and have no experience with scala. I don't understand what are and what does % and %% mean in Build.scala. I googled about them but couldn't find their meaning. ...
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Getting the encoding of a Postgres database

I have a database, and I need to know the default encoding for the database. I want to get it from the command line. 6 Answ...
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How do I modify a MySQL column to allow NULL?

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What are the rules for evaluation order in Java?

I am reading some Java text and got the following code: 5 Answers 5 ...
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Ruby on Rails form_for select field with class

I am beating my head against the wall on this one. I want to make a simple select tag using the f.select tag but nothing I do works. I put an example below: ...
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What is digest authentication?

How does Digest Authentication differ from Basic Authentication other than sending credentials as plain text? 3 Answers ...
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PHP namespaces and “use”

I am having a little trouble with namespaces and the use statements. 2 Answers 2 ...
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Filter git diff by type of change

Is there a way to limit git diff to changed files? 5 Answers 5 ...
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Recommended date format for REST GET API

What's the recommended timestamp format for a REST GET API like this: 5 Answers 5 ...
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R object identification

I am often ending up with a function producing output for which I don't understand the output data type. I'm expecting a list and it ends up being a list of lists or a data frame or something else. What's a good method or workflow for figuring out the output data type when first using a function? ...