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Join vs. sub-query
...y when it thinks one is faster than the other. It all depends on the data, indexes, correlation, amount of data, query, etc.
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What data type to use for hashed password field and what length?
...a key-strengthening hash algorithm like Bcrypt or Argon2i. For example, in PHP, use the password_hash() function, which uses Bcrypt by default.
$hash = password_hash("rasmuslerdorf", PASSWORD_DEFAULT);
The result is a 60-character string similar to the following (but the digits will vary, because...
What is the JavaScript >>> operator and how do you use it?
... 0xFFFFFFFF.
In this case this is useful because ECMAScript defines Array indexes in terms of 32 bit unsigned ints. So if you're trying to implement array.filter in a way that exactly duplicates what the ECMAScript Fifth Edition standard says, you would cast the number to 32-bit unsigned int like t...
Changing the size of a column referenced by a schema-bound view in SQL Server
...ame problem and unfortunately we are using SCHEMABINDING views in order to index the views. So in my case I'm not using SCHEMABINDING to explicitly block changes to the underlying tables but only to comply with requirements of SQL Server to used indexed views. I would also like to bypass this withou...
MongoDB atomic “findOrCreate”: findOne, insert if nonexistent, but do not update
...
Beginning with MongoDB 2.4, it's no longer necessary to rely on a unique index (or any other workaround) for atomic findOrCreate like operations.
This is thanks to the $setOnInsert operator new to 2.4, which allows you to specify updates which should only happen when inserting documents.
This, c...
What does (function($) {})(jQuery); mean?
...ny other (a, $b, a$b etc.) and it doesn't have any
special meaning like in PHP.
Knowing that we can take another look at our example:
var $f = function($) { return $*$; };
var jQuery = 2;
console.log( $f(jQuery) ); // Gives: 4
// An inline version (immediately invoked)
console.log( (function($) ...
Javascript Functions and default parameters, not working in IE and Chrome
...or are you saying the Mozilla docs are inaccurate?
– php-b-grader
Jun 19 at 0:12
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Get event listeners attached to node using addEventListener
...isteners
var register_element=function(element){
if(_elements_.indexOf(element)==-1){
// NB : split by useCapture to make listener easier to find when removing
var elt_listeners=[{/*useCapture=false*/},{/*useCapture=true*/}];
_elements_.push(element);
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Should you commit .gitignore into the Git repos?
...ly do commit .gitignore. In fact, I personally go as far as making sure my index is always clean when I'm not working on something. (git status should show nothing.)
There are cases where you want to ignore stuff that really isn't project specific. For example, your text editor may create automatic...
Equals(=) vs. LIKE
...ne of 3 million rows and one of 10 thousand rows.
When using a like on an index as below(no wildcards), it took about 30 seconds:
where login like '12345678'
using 'explain' I get:
When using an '=' on the same query, it took about 0.1 seconds:
where login ='12345678'
Using 'explain' I g...