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IN vs OR in the SQL WHERE Clause
... your specific data to see which is faster.
I tried both on a MySQL with 1000000 rows. When the column is indexed there is no discernable difference in performance - both are nearly instant. When the column is not indexed I got these results:
SELECT COUNT(*) FROM t_inner WHERE val IN (1000, 2000, ...
Swapping two variable value without using third variable
...mory locations (rather than different values). This is because (p xor p) = 0 and if both x and y share the same memory location, when one is set to 0, both are set to 0.
When both *x and *y are 0, all other xor operations on *x and *y will equal 0 (as they are the same), which means that the functio...
How to dismiss a Twitter Bootstrap popover by clicking outside?
...'popover'
&& $(e.target).parents('.popover.in').length === 0) {
$('[data-toggle="popover"]').popover('hide');
}
});
For buttons containing icons use (this code has a bug in Bootstrap 3.3.6, see the fix below in this answer)
$('body').on('click', function (e) {
...
Error-Handling in Swift-Language
... in exception path than in success path. This is not the case with Swift 2.0 errors, where success path and error path cost roughly the same.
All error throwing code must be declared, while exceptions might have been thrown from anywhere. All errors are "checked exceptions" in Java nomenclature. How...
Measuring function execution time in R
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In Git, what is the difference between origin/master vs origin master?
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406
There are actually three things here: origin master is two separate things, and origin/master i...
How to skip to next iteration in jQuery.each() util?
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790
What they mean by non-false is:
return true;
So this code:
var arr = ["one", "two", "thr...
LINQ To Entities does not recognize the method Last. Really?
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edited Sep 3 '11 at 14:30
answered Sep 3 '11 at 14:17
Nei...
Refresh a page using PHP
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You can do it with PHP:
header("Refresh:0");
It refreshes your current page, and if you need to redirect it to another page, use following:
header("Refresh:0; url=page2.php");
share
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How can I link to a specific glibc version?
When I compile something on my Ubuntu Lucid 10.04 PC it gets linked against glibc. Lucid uses 2.11 of glibc. When I run this binary on another PC with an older glibc, the command fails saying there's no glibc 2.11...
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