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Why does Oracle 9i treat an empty string as NULL?

...does consider ' ' as NULL , but that doesn't do much to tell me why this is the case. As I understand the SQL specifications, ' ' is not the same as NULL -- one is a valid datum, and the other is indicating the absence of that same information. ...
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When to use Tornado, when to use Twisted / Cyclone / GEvent / other [closed]

Which of these frameworks / libraries would be the best choise for building modern multiuser web application? I would love to have an asynchronous webserver which will allow me to scale easly. What solution will give the best performance / scalability / most useful framework (in terms of easy ...
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Is List a subclass of List? Why are Java generics not implicitly polymorphic?

I'm a bit confused about how Java generics handle inheritance / polymorphism. 17 Answers ...
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What is an OS kernel ? How does it differ from an operating system? [closed]

... kernel and an operating system. I do not see any difference between them. Is the kernel an operating system? 11 Answers ...
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Regarding 'main(int argc, char *argv[])' [duplicate]

Every program is starting with the main(int argc, char *argv[]) definition. 8 Answers ...
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Proper use of the IDisposable interface

...rom reading the Microsoft documentation that the "primary" use of the IDisposable interface is to clean up unmanaged resources. ...
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Is Javascript a Functional Programming Language?

...called a Functional Programming language? The main thing I think it lacks is Pure Functions, and it doesn't 'feel' like other functional languages, like lisp (although thats not really a good reason for it not to be a functional langauge...) ...
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Should I use `import os.path` or `import os`?

According to the official documentation , os.path is a module. Thus, what is the preferred way of importing it? 6 Answer...
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What is a Maven artifact?

What is an artifact and why does Maven need it? 9 Answers 9 ...
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Formula to determine brightness of RGB color

... share | improve this answer | follow | edited Jun 12 '14 at 9:50 ...