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How can I select rows with most recent timestamp for each key value?
...ORDER BY sensorID, timestamp;
Pretty self-explaining I think, but here's more info if you wish, as well as other examples. It's from the MySQL manual, but above query works with every RDBMS (implementing the sql'92 standard).
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What guarantees are there on the run-time complexity (Big-O) of LINQ methods?
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Split a python list into other “sublists” i.e smaller lists [duplicate]
... len(data), 100)]
If you are using python 2.x instead of 3.x, you can be more memory-efficient by using xrange(), changing the above code to:
chunks = [data[x:x+100] for x in xrange(0, len(data), 100)]
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How to know if other threads have finished?
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Use locks or synchronizers or mechanisms from java.util.concurrent, or
More orthodox, create a listener in your main Thread, and then program each of your Threads to tell the listener that they have completed.
How to implement Idea #5? Well, one way is to first create an interface:
public in...
How can I make setInterval also work when a tab is inactive in Chrome?
...s, you can use HTML5 Web Workers. Take a look at Möhre's answer below for more details...
CSS vs JS "animations"
This problem and many others could be avoided by using CSS transitions/animations instead of JavaScript based animations which adds a considerable overhead. I'd recommend this jQuery ...
How to center align the cells of a UICollectionView?
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Illegal pattern character 'T' when parsing a date string to java.util.Date
...in maintenance mode, advises migration to the java.time classes.
To learn more, see the Oracle Tutorial. And search Stack Overflow for many examples and explanations. Specification is JSR 310.
You may exchange java.time objects directly with your database. Use a JDBC driver compliant with JDBC 4.2...
how to write setTimeout with params by Coffeescript
...you doing setting thousands of timeouts per second, anyway?)
Of course, a more straightforward approach is to simply name your callback, which tends to produce more readable code anyway (jashkenas is a big fan of this idiom):
callback = -> something param
setTimeout callback, 1000
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Can I automatically increment the file build version when using Visual Studio?
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