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How do I make many-to-many field optional in Django?

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How to round up a number to nearest 10?

How can we round off a number to the nearest 10 in php? 16 Answers 16 ...
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Haskell: Lists, Arrays, Vectors, Sequences

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Private vs Public in Cache-Control

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Call to undefined method mysqli_stmt::get_result

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LINQ - Left Join, Group By, and Count

... 189 from p in context.ParentTable join c in context.ChildTable on p.ParentId equals c.ChildParentI...
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How to do date/time comparison

... 111 Use the time package to work with time information in Go. Time instants can be compared us...
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What does PHP keyword 'var' do?

...t will raise an E_STRICT warning in PHP from version 5.0.0 up to version 5.1.2, as of when it was deprecated. Since PHP 5.3, var has been un-deprecated and is a synonym for 'public'. Example usage: class foo { var $x = 'y'; // or you can use public like... public $x = 'y'; //this is also a...
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How can I convert a file pointer ( FILE* fp ) to a file descriptor (int fd)?

... 214 The proper function is int fileno(FILE *stream). It can be found in <stdio.h>, and is a P...
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How to copy directories in OS X 10.7.3?

... 251 Is there something special with that directory or are you really just asking how to copy directo...