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MySQL ON vs USING?

In a MySQL JOIN , what is the difference between ON and USING() ? As far as I can tell, USING() is just more convenient syntax, whereas ON allows a little more flexibility when the column names are not identical. However, that difference is so minor, you'd think they'd just do away with USI...
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ObservableCollection Doesn't support AddRange method, so I get notified for each item added, besides

I want to be able to add a range and get updated for the entire bulk. 12 Answers 12 ...
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Python integer division yields float

Is this intended? I strongly remember earlier versions returning int/int=int ? What should I do, is there a new division operator or must I always cast? ...
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How do I get rid of this unwanted bar from Eclipse?

When coding in Eclipse(Indigo), I accidentally hit a combination of keys which made this bar appear when I was doing some shortcuts. This question has probably being answered before but since I don't know the exact name of the bar googling the problem has being fruitless. I've spent two hours trying...
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Converting datetime.date to UTC timestamp in Python

I am dealing with dates in Python and I need to convert them to UTC timestamps to be used inside Javascript. The following code does not work: ...
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Is there a naming convention for MySQL?

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How can I get a list of build targets in Ant?

My codebase has a long build.properties file written by someone else. I want to see the available built targets without having to search through the file manually. Does ant have a command for this - something like ant show-targets - that will make it list all the targets in the build file? ...
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How can I open Windows Explorer to a certain directory from within a WPF app?

In a WPF application, when a user clicks on a button I want to open the Windows explorer to a certain directory, how do I do that? ...
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Scala: Nil vs List()

In Scala, is there any difference at all between Nil and List() ? 3 Answers 3 ...
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What is difference between cacerts and keystore?

What's the difference between the two, cacerts and keystore? 4 Answers 4 ...