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equals vs Arrays.equals in Java
...() does not work as expected for multidimensional arrays, it only compares items of the 1st dimension for reference equality. Apache commons ArrayUtils.isEquals works with multidimensional arrays.
– Adam Parkin
Mar 18 '13 at 17:43
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SQL Query to concatenate column values from multiple rows in Oracle
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LISTAGG delivers the best performance if sorting is a must(00:00:05.85)
SELECT pid, LISTAGG(Desc, ' ') WITHIN GROUP (ORDER BY seq) AS description
FROM B GROUP BY pid;
COLLECT delivers the best performance if sorting is not needed(00:00:02.90): ...
Reload the path in PowerShell
...t variables, use a function to reset them all
function resetEnv {
Set-Item `
-Path (('Env:', $args[0]) -join '') `
-Value ((
[System.Environment]::GetEnvironmentVariable($args[0], "Machine"),
[System.Environment]::GetEnvironmentVariable($args[0], "User")
...
Aligning a float:left div to center?
...vertically give the container a height (e.g. height: 500px;) and add align-items: center;
– Jan Derk
Aug 11 at 19:13
add a comment
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Difference between static memory allocation and dynamic memory allocation
...hat allocates a large static array of either 10k, 1m, 10m, 100m, 1G or 10G items. For many compilers, the binary size will keep growing linearly with the size of the array, and past a certain point, it will shrink again as the compiler uses another allocation strategy.
Register Memory
The last mem...
App Inventor 2 拓展参考文档 · App Inventor 2 中文网
...px 15px rgba(0, 0, 0, .1); display: flex; flex-direction: column; align-items: center; } .feedback-pop:hover, .feedback-pop .feedback-img:hover { color: #3773f5 } .feedback-pop .feedback-img { display: inline-block; width: 24px; height: 24px; margin-bottom: 4px; background: url(/static/imag...
What is the most accurate way to retrieve a user's correct IP address in PHP?
... and fully-packaged, version of @AlixAxel's answer:
<?php
/* Get the 'best known' client IP. */
if (!function_exists('getClientIP'))
{
function getClientIP()
{
if (isset($_SERVER["HTTP_CF_CONNECTING_IP"]))
{
$...
jQuery.parseJSON throws “Invalid JSON” error due to escaped single quote in JSON
...sers seem to follow that principle with regard to JSON: joelonsoftware.com/items/2008/03/17.html
– Justin Ethier
Nov 7 '12 at 15:12
1
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Why use a READ UNCOMMITTED isolation level?
... could handle that by starting a transaction fetching the data like select item from things with (UPDLOCK) . Put a quick timeout in there so that if it can't acquire the lock fast it tells the user it's being edited. That will keep you safe not just from users but developers. Only trouble here is y...
What is the difference between MOV and LEA?
...ective Address
MOV means Load Value
In short, LEA loads a pointer to the item you're addressing whereas MOV loads the actual value at that address.
The purpose of LEA is to allow one to perform a non-trivial address calculation and store the result [for later usage]
LEA ax, [BP+SI+5] ; Compute a...