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Difference between TCP and UDP?
...guarantees that all sent packets will reach the destination in the correct order. This imply the use of acknowledgement packets sent back to the sender, and automatic retransmission, causing additional delays and a general less efficient transmission than UDP.
UDP is a connection-less protocol. Com...
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...
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...
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 ...
Change multiple files
...yz/g' xa*
This will work for a moderate amount of files, probably on the order of tens, but probably not on the order of millions.
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Declaring an unsigned int in Java
...ll of these types extend java.lang.Number and can be converted into higher-order primitive types and BigInteger. Hope this helps.
(Disclaimer: I work for the company behind these libraries)
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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
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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...
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...
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...