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Nullable Foreign Key bad practice?

Let's say you have a table Orders with a foreign key to a Customer Id. Now, suppose you want to add an Order without a Customer Id, (whether that should be possible is another question) you would have to make the foreign key NULL... Is that bad practice or would you rather work with a link table bet...
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How do you display code snippets in MS Word preserving format and syntax highlighting?

Does anyone know a way to display code in Microsoft Word documents that preserves coloring and formatting? Preferably, the method would also be unobtrusive and easy to update. ...
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What are the best PHP input sanitizing functions?

...pes. Everything submitted is initially treated like a string, so forcing known-numeric data into being an integer or float makes sanitization fast and painless. What about free-form text fields and textareas? You need to make sure that there's nothing unexpected in those fields. Mainly, you need ...
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What does “SyntaxError: Missing parentheses in call to 'print'” mean in Python?

... from being a distinct statement to being an ordinary function call, so it now needs parentheses: >>> print("Hello, World!") Hello, World! In earlier versions of Python 3, the interpreter just reports a generic syntax error, without providing any useful hints as to what might be going wr...
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Git in Visual Studio - add existing project?

... you. Between a manual git init and this, this is my preferred method from now on. – MrCC Jun 20 '15 at 18:46 If you w...
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Get Character value from KeyCode in JavaScript… then trim

This is what I have now: 10 Answers 10 ...
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How to model type-safe enum types?

... Btw. valueOf method is now dead :-( – greenoldman Nov 23 '11 at 12:29 36 ...
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How to use the “number_to_currency” helper method in the model rather than view?

... a new class for generating your output instead of making your data model know what a CSV is (because it shouldn’t). As for using helpers for ActiveModel validation errors in the model, well, I’m sorry but ActiveModel/Rails has screwed us all there by forcing error messages to be realized in th...
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When to use setAttribute vs .attribute= in JavaScript?

...o support old browsers, in addition to this information, you will need to know what is broken in the those browsers. share | improve this answer | follow | ...
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Why is using onClick() in HTML a bad practice?

...L is a bad practice, because it's not good for semantics. I would like to know what the downsides are and how to fix the following code? ...