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What is PostgreSQL explain telling me exactly?

MySQL's explain output is pretty straightforward. PostgreSQL's is a little more complicated. I haven't been able to find a good resource that explains it either. ...
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C# HttpWebRequest vs WebRequest

I saw this piece of code: 3 Answers 3 ...
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Check a radio button with javascript

For some reason, I can't seem to figure this out. 6 Answers 6 ...
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What does the KEY keyword mean?

In this MySQL table definition: 2 Answers 2 ...
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How do you use Mongoose without defining a schema?

In previous versions of Mongoose (for node.js) there was an option to use it without defining a schema 5 Answers ...
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Matplotlib plots: removing axis, legends and white spaces

I'm new to Python and Matplotlib, I would like to simply apply colormap to an image and write the resulting image, without using axes, labels, titles or anything usually automatically added by matplotlib. Here is what I did: ...
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Why are iframes considered dangerous and a security risk?

Why are iframes considered dangerous and a security risk? Can someone describe an example of a case where it can be used maliciously? ...
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Map and Reduce in .NET

What scenarios would warrant the use of the " Map and Reduce " algorithm? 3 Answers 3 ...
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Android: install .apk programmatically [duplicate]

I made this with help from Android download binary file problems and Install Application programmatically on Android . ...
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What is the difference between persist() and merge() in JPA and Hibernate?

What is the difference between persist() and merge() in Hibernate? 4 Answers 4 ...