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Aggregate / summarize multiple variables per group (e.g. sum, mean)

... what if I instead of x1 and x2 I want to use all the remaining variables (other than year, month) – Clock Slave Mar 16 '16 at 11:22 8 ...
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IntelliJ: How to auto-highlight variables like in Eclipse

... You'll definitely want to install the "Identifier Highlighter" plugin too, which allows you to easily navigate between highlighted usages. – Daniel Alexiuc Sep 20 '11 at 0:15 ...
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Copy rows from one Datatable to another DataTable?

... Though your answer technically is correct, your code sample doesn't address your assumptions. The answer by @RageeshGr handles all the assumptions and IMHO is written more concisely and is less error prone. – chris.nesbit1 ...
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View's getWidth() and getHeight() returns 0

I am creating all of the elements in my android project dynamically. I am trying to get the width and height of a button so that I can rotate that button around. I am just trying to learn how to work with the android language. However, it returns 0. ...
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Git fast forward VS no fast forward merge

Git merge allow us to perform fast forward and no fast fast forward branch merging. Any ideas when to use fast forward merge and when to use no fast forward merge? ...
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Is there an equivalent of CSS max-width that works in HTML emails?

I'm trying to create an HTML email that will display properly in all widely used email clients. I'm wrapping the whole email in a table, and I'd like it to have a width that is up to 98% of the available width, but no greater than 800 pixels. Like this: <table style="width:98%; max-width:800px...
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Java Interfaces/Implementation naming convention [duplicate]

...tation tautology that adds nothing but more stuff to type to your code. All modern Java IDE's mark Interfaces and Implementations and what not without this silly notation. Don't call it TruckClass that is tautology just as bad as the IInterface tautology. If it is an implementation it is a cla...
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How to update a single library with Composer?

I need to install only 1 package for my SF2 distribution (DoctrineFixtures). 8 Answers ...
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Several ports (8005, 8080, 8009) required by Tomcat Server at localhost are already in use

... Tomcat default home page or a Tomcat-specific 404 error page. Both are equally valid evidence that Tomcat runs fine; if it didn't, then you would have gotten a browser specific HTTP connection timeout error message. You need to shutdown it. Go to /bin subfolder of the Tomcat installation folder an...
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How to extract request http headers from a request using NodeJS connect

...this more helpful than the accepted answer above. The JSON.stringify makes all the difference. – Patrick Sep 8 '15 at 20:39 1 ...