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How to get execution time in rails console?

I want compare time of execution Post.all and SELECT * FROM posts (or some other statements) How can i get execution time of Post.all ? ...
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XPath query to get nth instance of an element

There is an HTML file (whose contents I do not control) that has several input elements all with the same fixed id attribute of "search_query" . The contents of the file can change, but I know that I always want to get the second input element with the id attribute "search_query" . ...
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How to work with complex numbers in C?

How can I work with complex numbers in C? I see there is a complex.h header file, but it doesn't give me much information about how to use it. How to access real and imaginary parts in an efficient way? Is there native functions to get module and phase? ...
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ASP.NET MVC 3 Razor: Include JavaScript file in the head tag

I'm trying to figure out the proper Razor syntax to get a JavaScript file for a particular *.cshtml to be in the head tag along with all the other include files that are defined in _Layout.cshtml. ...
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What is the difference between Android margin start/end and right/left?

What is difference between Android margin start and right (or margin end and left)? 2 Answers ...
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Composite Key with EF 4.1 Code First

I am trying to figure out how to have a composite key using EF code First 4.1 RC. 2 Answers ...
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Sass and combined child selector

I've just discovered Sass, and I've been so excited about it. 2 Answers 2 ...
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Difference between CMAKE_CURRENT_SOURCE_DIR and CMAKE_CURRENT_LIST_DIR

CMAKE_CURRENT_SOURCE_DIR this is the directory where the currently processed CMakeLists.txt is located in 1 Answer ...
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How do you implement an async action delegate method?

I am learning the Web API stack and I am trying to encapsulate all data in the form of a "Result" object with parameters such as Success and ErrorCodes. ...
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How to get correct timestamp in C#

I would like to get valid timestamp in my application so I wrote: 5 Answers 5 ...