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Difference between two dates in MySQL
...
SELECT TIMEDIFF('2007-12-31 10:02:00','2007-12-30 12:01:01');
-- result: 22:00:59, the difference in HH:MM:SS format
SELECT TIMESTAMPDIFF(SECOND,'2007-12-30 12:01:01','2007-12-31 10:02:00');
-- result: 79259 the difference in se...
jquery input select all on focus
...ype=text]").focus(function() {
var save_this = $(this);
window.setTimeout (function(){
save_this.select();
},100);
});
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Why does Git say my master branch is “already up to date” even though it is not?
...es/origin/master (but in your case, remotes/upstream/master). Most of the time you get to omit the remotes/ part too, so you can refer to that original copy as upstream/master.
If you now make and commit some change(s) to some file(s), you're the only one with those changes. Meanwhile other peopl...
Commenting code in Notepad++
...s you to block comment.
Also note that pressing the combination multiple times allows you to add multiple "#"s (sometimes I use that while testing to differentiate from other comments)
2) Ctrl+Shift+K (on the commented region) allows you to perform block uncomment
3) Ctrl+Shift+K on an uncomment...
How do I get around type erasure on Scala? Or, why can't I get the type parameter of my collections?
... Machine (JVM), unlike Java, did not get generics. This means that, at run time, only the class exists, not its type parameters. In the example, JVM knows it is handling a scala.collection.immutable.List, but not that this list is parameterized with Int.
Fortunately, there's a feature in Scala that ...
What are the most interesting equivalences arising from the Curry-Howard Isomorphism?
...
@RD1: You think that's bad, I've spent so much time thinking in Haskell that I have to mentally translate formulas of predicate logic into type signatures before they make sense. :( Not to mention that the law of the excluded middle and such starts to seem really confusin...
Why are private fields private to the type, not the instance?
...k one reason it works this way is because access modifiers work at compile time. As such, determining whether or not a given object is also the current object isn't easy to do. For example, consider this code:
public class Foo
{
private int bar;
public void Baz(Foo other)
{
oth...
When should you use 'friend' in C++?
...out << (a + b).getValue(); // valid
}
Private CRTP Base Class
Sometimes, you find the need that a policy needs access to the derived class:
// possible policy used for flexible-class.
template<typename Derived>
struct Policy {
void doSomething() {
// casting this to Deriv...
Timeout function if it takes too long to finish [duplicate]
...signal.
The basic idea is to use signal handlers to set an alarm for some time interval and raise an exception once that timer expires.
Note that this will only work on UNIX.
Here's an implementation that creates a decorator (save the following code as timeout.py).
from functools import wraps
im...
Why no love for SQL? [closed]
...pproach is fantastic, and it's actually modern (think LINQ). It's true sometimes you need to tweak for speed, and a procedural alternative to SQL might be useful then. But I'd still be using declarative SQL most of the time for the simplicity.
– MarkJ
Oct 29 '0...