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Best way to select random rows PostgreSQL
... table and then picks the first 1000 items. Sorting a large table not only reads that table but also involves reading and writing temporary files. The where random() < 0.1 only scans the complete table once.
For large tables this might not what you want as even one complete table scan might take...
load scripts asynchronously
...t('script');
s.type = 'text/javascript';
s.src = src;
s.onload = s.onreadystatechange = function() {
//console.log( this.readyState ); //uncomment this line to see which ready states are called.
if ( !r && (!this.readyState || this.readyState == 'complete') )
{
r = tr...
INNER JOIN ON vs WHERE clause
...JOIN is ANSI syntax which you should use.
It is generally considered more readable, especially when you join lots of tables.
It can also be easily replaced with an OUTER JOIN whenever a need arises.
The WHERE syntax is more relational model oriented.
A result of two tables JOINed is a cartesian ...
Why is char[] preferred over String for passwords?
... If a process has access to memory of your application, then that is already a security breach, right?
– Yeti
Sep 1 '15 at 11:26
8
...
google oauth2 redirect_uri with several parameters
...otect against CSRF, I'll try to show a proper method. Rather than passing (read exposing) data it should be kept local. Hydrate it before the request and re-hydrate it after a validated request. "Validated" here means that the state-nonce of request and response match.
You need some kind of temporar...
What is “stdafx.h” used for in Visual Studio?
...instead of starting from scratch, the compiler starts compiling from the already saved results of compiling everything in stdafx.h.
I don't believe that this trick is unique to Microsoft compilers, nor do I think it was an original development.
For Microsoft compilers, the setting that controls th...
How to display request headers with command line curl
...
Read the question - this is for response headers not request headers
– Graeme Stuart
Nov 4 '14 at 14:12
6...
Android Gallery on Android 4.4 (KitKat) returns different URI for Intent.ACTION_GET_CONTENT
...l int takeFlags = data.getFlags()
& (Intent.FLAG_GRANT_READ_URI_PERMISSION
| Intent.FLAG_GRANT_WRITE_URI_PERMISSION);
// Check for the freshest data.
getContentResolver().takePersistableUriPermission(originalUri, takeFlags);
}
loadSomeStre...
Erlang's 99.9999999% (nine nines) reliability
...ong says here:
The AXD301 has achieved a NINE nines reliability (yes, you read that right, 99.9999999%). Let’s put this in context: 5 nines is reckoned to be good (5.2 minutes of downtime/year). 7 nines almost unachievable ... but we did 9.
Why is this? No shared state, plus a sophisticated error...
Comparing object properties in c# [closed]
... compare one, otherwise it's shallow
CompareFields = false,
CompareReadOnly = true,
ComparePrivateFields = false,
ComparePrivateProperties = false,
CompareProperties = true,
MaxDifferences = 1,
ElementsToIgnore = new List<string>() { "Filter" }
};
Assert.IsTrue(
...