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How do short URLs services work?
...r tiny urls. You'll mistakenly hear that they create a hash of the URL in order to generate that unique code for the shortened URL. This is incorrect in most cases, they aren't using a hashing algorithm (where you could potentially have collisions).
Most of the popular URL shortening services simp...
Algorithm for creating a school timetable
...rties. It was extremely steep, one property easily able to change it by an order of magnitude up or down - and there were hundreds or thousands of properties in one organism. This resulted in absolutely HUGE numbers as the weights, and as a direct result, need to use a bignum library (gmp) to perfor...
Adding VirtualHost fails: Access Forbidden Error 403 (XAMPP) (Windows 7)
.../dummy-htdocs">
# AllowOverride All # Deprecated
# Order Allow,Deny # Deprecated
# Allow from all # Deprecated
# --New way of doing it
Require all granted
</Directory>
</VirtualHost>
First, I saw that it's necessary...
MySQL convert date string to Unix timestamp
... After so many trials your solution worked for me: select * from (SELECT order_increment_id, FROM_UNIXTIME(UNIX_TIMESTAMP(STR_TO_DATE(order_date, '%d %M %Y %h:%i:%s %p')),'%Y-%m-%d') as order_date, email_sent FROM `packingslip_header` where email_sent=0) t where order_date >= '2019-11-13' O...
Command not found when using sudo
...
Permission denied
In order to run a script the file must have an executable permission bit set.
In order to fully understand Linux file permissions you can study the documentation for the chmod command. chmod, an abbreviation of change mode, is ...
Completely uninstall PostgreSQL 9.0.4 from Mac OSX Lion?
... tanks again @JamesA. do i need to remove anything manually in order to be sure the slate is wiped completely clean? You can check my latest update with the output of "sudo find"
– Ramy
Nov 7 '11 at 15:26
...
Is using a lot of static methods a bad thing?
...to the class to find its dependencies and initialise things in the correct order. In this case, it needs the ResourceLoader to be initialised before running. Now scale up this dependency nightmare and you can probably guess what will happen. Imagine trying to maintain code where there is no expli...
Simple way to transpose columns and rows in SQL?
...oPivot+' , name, value, ROW_NUMBER() over (partition by '+@columnToPivot+' order by '+@columnToPivot+') as rowid
from '+@tableToPivot+'
unpivot
(
value for name in ('+@colsUnpivot+')
) unpiv
) src
pivot
(
sum(value...
prevent property from being serialized in web API
...t you want:
First way: Decorate your field with JsonProperty attribute in order to skip the serialization of that field if it is null.
public class Foo
{
public int Id { get; set; }
public string Name { get; set; }
[JsonProperty(NullValueHandling = NullValueHandling.Ignore)]
publi...
C# listView, how do I add items to columns 2, 3 and 4 etc?
...
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