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MySQL: how to get the difference between two timestamps in seconds

Is there a way I can make a query in MySQL that will give me the difference between two timestamps in seconds, or would I need to do that in PHP? And if so, how would I go about doing that? ...
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When to use Storyboard and when to use XIBs

...yboards. My learnings are: Storyboards are nice for apps with a small to medium number of screens and relatively straightforward navigation between views. If you have lots of views and lots of cross-navigation between them the Storyboard view gets confusing and too much work to keep clean. For a l...
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How do you format the day of the month to say “11th”, “21st” or “23rd” (ordinal indicator)?

I know this will give me the day of the month as a number ( 11 , 21 , 23 ): 19 Answers ...
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Random row from Linq to Sql

...to retrieve a random row using Linq to SQL when I have a condition, e.g. some field must be true? 15 Answers ...
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Running unittest with typical test directory structure

...n -m unittest test.test_antigravity Just reference the test module the same way you import it. Running a single test case or test method: Also you can run a single TestCase or a single test method: $ python -m unittest test.test_antigravity.GravityTestCase $ python -m unittest test.test_antigra...
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Python Matplotlib figure title overlaps axes label when using twiny

I am trying to plot two separate quantities on the same graph using twiny as follows: 6 Answers ...
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Hidden features of Perl?

What are some really useful but esoteric language features in Perl that you've actually been able to employ to do useful work? ...
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How do I get a class instance of generic type T?

I have a generics class, Foo<T> . In a method of Foo , I want to get the class instance of type T , but I just can't call T.class . ...
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What is the native keyword in Java for?

While playing this puzzle (It's a Java keyword trivia game), I came across the native keyword. 10 Answers ...
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Can TCP and UDP sockets use the same port?

First of all, is there any problem with using both UDP and TCP on the same server? 2 Answers ...