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GROUP_CONCAT ORDER BY

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How to write multiple line property value using PropertiesConfiguration?

I have a properties file with a property with a List value (comma separated), how to write this property in a multi-line ? (backslash after the comma)? ...
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NULL vs nil in Objective-C

In observeValueForKeyPath:ofObject:change:context: - why do the docs use NULL instead of nil when not specifying a context pointer? ...
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Possible to access the index in a Hash each loop?

I'm probably missing something obvious, but is there a way to access the index/count of the iteration inside a hash each loop? ...
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Why does scanf() need “%lf” for doubles, when printf() is okay with just “%f”?

Why is it that scanf() needs the l in " %lf " when reading a double , when printf() can use " %f " regardless of whether its argument is a double or a float ? ...
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Regex how to match an optional character

I have a regex that I thought was working correctly until now. I need to match on an optional character. It may be there or it may not. ...
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Find the extension of a filename in Ruby

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How to sort the result from string_agg()

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Python argparse mutual exclusive group

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Ternary Operator Similar To ?:

I am trying to avoid constructs like this: 5 Answers 5 ...