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count(*) vs count(column-name) - which is more correct? [duplicate]
...s a non-null expressions
Your use of COUNT(*) or COUNT(column) should be based on the desired output only.
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How can I prevent SQL injection in PHP?
...d queries. These are SQL statements that are sent to and parsed by the database server separately from any parameters. This way it is impossible for an attacker to inject malicious SQL.
You basically have two options to achieve this:
Using PDO (for any supported database driver):
$stmt = $pdo-&g...
Is there a properly tested alternative to Select2 or Chosen? [closed]
... possible alternative is bootstrap-multiselect
"JQuery multiselect plugin based on Twitter Bootstrap"
Examples and documentation: http://davidstutz.github.io/bootstrap-multiselect/
The repository does not contain any automated tests, manual tests instead
Themed using Bootstrap 3
JavaScript sourc...
How do I select an element with its name attribute in jQuery? [duplicate]
...+ '"]',
document.getElementById('searcharea')); // with a search base
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Multiprocessing - Pipe vs Queue
...ow you to increase the size of a file, but the maximum size allowed varies based on system configurations. You should therefore never rely on Pipe() to buffer data. Calls to connection.send could block until data gets read from the pipe somehwere else.
In conclusion, Queue is a better choice than ...
Different types of thread-safe Sets in Java
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On ConcurrentHashMap based set, "thus try to avoid this by estimating the needed size on creation." The size you give to the map should be over 33% larger than your estimate (or known value), since the set resizes at 75% load. I use expectedSize ...
How to go back (ctrl+z) in vi/vim
...esent, but the value added of my answer is redo as Ctrl + r (lower case r) based on the documentation. Nobody before put it here. In addition, I tried to make the answer as clearly as possible.
– simhumileco
Mar 22 '19 at 2:36
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Remove plot axis values
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Using base graphics, the standard way to do this is to use axes=FALSE, then create your own axes using Axis (or axis). For example,
x <- 1:20
y <- runif(20)
plot(x, y, axes=FALSE, frame.plot=TRUE)
Axis(side=1, labels=FALSE)...
Possibility of duplicate Mongo ObjectId's being generated in two different collections?
...manner similar to UUID but with some nicer properties for storage in a database such as roughly increasing order and encoding their creation time for free. The key thing for your use case is that they are designed to guarantee uniqueness to a high probability even if they are generated on different ...
How to filter NSFetchedResultsController (CoreData) with UISearchDisplayController/UISearchBar
I'm trying to implement search code in my CoreData-based iPhone app. I'm not sure how to proceed. The app already has an NSFetchedResultsController with a predicate to retrieve the data for the primary TableView. I want to make sure I'm on the right path before I change too much code. I'm confus...