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MySQL select where column is not empty
... very difficult to debug :(
If you're using strings (char, varchar, text, etc.), then this will be perfectly be fine, just be careful with numerics.
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Best algorithm for detecting cycles in a directed graph [closed]
...s, I suspect that at some point you are going to sort them into a proposed order of execution.
If that's the case, then a topological sort implementation may in any case detect cycles. UNIX tsort certainly does. I think it is likely that it is therefore more efficient to detect cycles at the same t...
How can I resize an image using Java?
... method highlighted in Filthy Rich Clients by Chet Haase and Romain Guy in order to generate high-quality thumbnails while ensuring acceptable runtime performance.
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Which is faster in Python: x**.5 or math.sqrt(x)?
...l namespace speeds it up more is probably because of the method resolution order: the compiler first checks if the function was defined in your code, then in any imports, so if it was defined locally it takes less time per lookup
– Rotem Shalev
Aug 21 at 11:26
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Globally override key binding in Emacs
... Afaik, binding these is the first step org-mode suggests in order to use it, but the user has to define them himself (i.e. it's not done by default), and may choose any other while doing so. (also, it's because these bindings are supposed to be global, not bound to the org major mode)...
How do I get a UTC Timestamp in JavaScript?
...should do the Math.floor / 1000 -- but still I would need that function in order to have the UTC timestamp of an existing date object... right?
– Merc
Mar 18 '12 at 5:22
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What does the double colon (::) mean in CSS?
...d to differentiate it from pseudo classes (like :hover, :first-child, :not etc). It's best to use : for before and after pseudo elements since the single colon has better browser support, namely in earlier IE versions.
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PHP - how to best determine if the current invocation is from CLI or web server?
...er, you'll get apache2handler. Hope this helps. I needed to use php-cgi in order to introduce $_GET variables: php-cgi myscript.php arg1=one arg2=two. Testing for not equal to apache2handler should be ok for apache.
– Sebastian
Jun 12 '13 at 1:01
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What is the best method of handling currency/money?
...in Rails console, send a call to the ActiveSupport's NumberHelper class in order to access the helper.
For example:
ActiveSupport::NumberHelper.number_to_currency(2_500_000.61, unit: '€', precision: 2, separator: ',', delimiter: '', format: "%n%u")
gives the following output
2500000,61€
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What exactly is Python multiprocessing Module's .join() Method Doing?
...od.
and
Note It is important to join() the process after terminating it in order to give the background machinery time to update the status of the object to reflect the termination.
This is a good example helped me understand it: here
One thing I noticed personally was my main process paused until t...