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Index on multiple columns in Ruby on Rails

I'm implementing functionality to track which articles a user has read. 2 Answers 2 ...
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MongoDB: Combine data from multiple collections into one..how?

How can I (in MongoDB) combine data from multiple collections into one collection? 11 Answers ...
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Aligning textviews on the left and right edges in Android layout

I am getting started with Android. I am having trouble getting a simple layout going. 9 Answers ...
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Multiple GitHub Accounts & SSH Config

I'm having some trouble getting two different SSH keys/GitHub accounts to play well together. I have the following setup: ...
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Reset auto increment counter in postgres

I would like to force the auto increment field of a table to some value, I tried with this: 12 Answers ...
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How to check edittext's text is email address or not?

how to check the text of edittext is email address or not without using javascript and regular expression? Here I used inputtype="textEmailAddress" this is working but no error message is display. ...
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LINQ: Distinct values

I have the following item set from an XML: 7 Answers 7 ...
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How To Create Table with Identity Column

I have an existing table that I am about to blow away because I did not create it with the ID column set to be the table's Identity column. ...
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On Duplicate Key Update same as insert

I've searched around but didn't find if it's possible. 8 Answers 8 ...
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How to find out client ID of component for ajax update/render? Cannot find component with expression

The following code is inspired from PrimeFaces DataGrid + DataTable Tutorials and put into a <p:tab> of a <p:tabView> residing in a <p:layoutUnit> of a <p:layout> . Here is the inner part of the code (starting from p:tab component); the outer part is trivial. ...