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COUNT(*) vs. COUNT(1) vs. COUNT(pk): which is better? [duplicate]
...bleHere.*), use that.
In short, don't use COUNT(1) for anything. It's a one-trick pony, which rarely does what you want, and in those rare cases is equivalent to count(*)
Use count(*) for counting
Use * for all your queries that need to count everything, even for joins, use *
SELECT boss.boss_...
How can I prevent SQL injection in PHP?
... Also, the official documentation of mysql_query only allows to execute one query, so any other query besides ; is ignored. Even if this is already deprecated there are a lot of systems under PHP 5.5.0 and that may use this function. php.net/manual/en/function.mysql-query.php
...
HTML 5: Is it , , or ?
... have your html be well-formed xml, that's it. Of course when transforming one into another you have to make sure it's still valid, but is it worth mentioning? :)
– Michael Krelin - hacker
Dec 22 '09 at 14:37
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How does the extend() function work in jQuery?
...ar);
Results in:
A: Foo=null Bar=a
Single Parameter
If you pass just one object to jQuery.extend(), then jQuery assumes that the jQuery object itself is the "first" parameter (ie: the one to be modified), and your object is the "second" (ie: the one to add to the first). So:
console.log( "Bef...
Why compile Python code?
...e .pyc file is almost invariably smaller. Especially if you comment a lot. One of mine is 28419 as .py, but only 17879 as .pyc -- so load time is better as well. Finally, you can precompile top level scripts this way: python -m compileall myscript.py
– fyngyrz
...
How to run only one local test class on Gradle
...d in turn to execute that single test quicker.
– falconepl
Feb 17 '16 at 13:50
2
This option is d...
Should it be “Arrange-Assert-Act-Assert”?
...d in all the other tests. This gives a better isolation of concerns, since one test case only verifies one thing.
There may be many preconditions that need to be satisfied for a given test case, so you may need more than one Guard Assertion. Instead of repeating those in all tests, having one (and ...
What is the advantage of using Restangular over ngResource?
...n this by "remembering" the URLs.
So if you do in some place
Restangular.one("users", 123).get().then(function(user) {
$scope.user = user;
});
// Some other code
//Automatically does the request to /users/123/cars as it remembers in which object you're asking it.
$scope.user.getList('cars')
...
What is the difference between using IDisposable vs a destructor in C#?
...
One extra thing to say. Do not add a finalizer to your class unless you really, really need one. If you add a finalizer (destructor) the GC has to call it (even an empty finalizer) and to call it the object will always surviv...
JS: iterating over result of getElementsByClassName using Array.forEach
...
You linked the wrong benchmark. Here is the correct one measurethat.net/Benchmarks/Show/4076/0/… Just ran it on my low-end phone, got 160k/s vs 380k/s. Since you mentioned DOM manipulation, here is that too measurethat.net/Benchmarks/Show/5705/0/… Got 50k/s vs 130k/s. As y...