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How to add not null constraint to existing column in MySQL

I have table name called "Person" with following column names 2 Answers 2 ...
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Log.INFO vs. Log.DEBUG [closed]

... and keep confusing myself between what kind of information i want to log with Log.INFO and Log.DEBUG. Are there any standards or rules of thumb on what each type of log message contains? ...
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How to print a double with two decimals in Android? [duplicate]

Maybe this is a silly question, but I cannot guess how to solve it if it's not creating a method. Maybe there's a "natural way" to do it, like in C for example. Here's the problem: ...
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Split string on whitespace in Python [duplicate]

... The str.split() method without an argument splits on whitespace: >>> "many fancy word \nhello \thi".split() ['many', 'fancy', 'word', 'hello', 'hi'] ...
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jQuery .on function for future elements, as .live is deprecated [duplicate]

... yet. Normally, I would use jQuery's .live function to handle this, but it seems that it is now deprecated in favor of .on . ...
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How to get the browser language using JavaScript [duplicate]

I want to detect the language of the browser that is entering my site, if it's En or Fr. So I can redirect to the En page or the other page. ...
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argparse: identify which subparser was used [duplicate]

I think this must be easy but I do not get it. 2 Answers 2 ...
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Convert a space delimited string to list [duplicate]

... states.split() will return ['Alaska', 'Alabama', 'Arkansas', 'American', 'Samoa', 'Arizona', 'California', 'Colorado'] If you need one random from them, then you have to use the random module: import random states = "... .....
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How to check for file existence [duplicate]

...here I could pass "a full path", home/me/a_file.txt , to identify whether it is a valid file path? 2 Answers ...
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Have a variable in images path in Sass?

...ble that contains the root path to all my images in my CSS file. I can't quite figure out if this is possible in pure Sass (the actual web project is not RoR, so can't use asset_pipeline or any of that fancy jazz). ...