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Difference between a theta join, equijoin and natural join
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A theta join allows for arbitrary comparison relationships (such as ≥).
An equijoin is a theta join using the equality operator.
A natural join is an equijoin on attributes that have the same name in each relationship.
Additionally,...
Python str vs unicode types
...the proper encoding format, as we don't know which one is being used internally to represent the unicode value.
– Caumons
Aug 3 '13 at 15:45
10
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background:none vs background:transparent what is the difference?
...peat
background-attachment
background-position
That's mean, you can group all styles in one, like:
background: red url(../img.jpg) 0 0 no-repeat fixed;
This would be (in this example):
background-color: red;
background-image: url(../img.jpg);
background-repeat: no-repeat;
background-attachment: fi...
What's the result of += in C and C++?
...7.1:
The assignment operator (=) and the compound assignment operators all group right-to-left. All require a modifiable
lvalue as their left operand and return an lvalue with the type and value of the left operand after the assignment has taken place.
EDIT : The behavior of (i+=10)+=10 in ...
Capistrano - clean up old releases
Usually when using capistrano, I will go and manually delete old releases from a deployed application. I understand that you can run cap deploy:cleanup but that still leaves 5 releases. Is this it's intended purpose? Is there another way to cleanup old releases to just 1 previous deploy?
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Sublime Text 2: Trim trailing white space on demand
...ing spaces and delete them in a flash.
ST2 provides a way to automatically delete trailing spaces upon file
save. Depending on your settings, it may be more handy to just
highlight them and/or delete them by hand. This plugin provides just
that!
Usage: click "Edit / Trailing Spaces / De...
Are default enum values in C the same for all compilers?
When declaring an enum as shown below, do all C compilers set the default values as x=0 , y=1 , and z=2 on both Linux and Windows systems?
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Enabling error display in PHP via htaccess only
... configuration files (e.g. httpd.conf) and .htaccess files. You will need "AllowOverride Options" or "AllowOverride All" privileges to do so. php.net/manual/en/configuration.changes.php
– silex
May 25 '11 at 17:01
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How to remove all line breaks from a string
...haracter encoding.)
Therefore, the most efficient RegExp literal to match all variants is
/\r?\n|\r/
If you want to match all newlines in a string, use a global match,
/\r?\n|\r/g
respectively. Then proceed with the replace method as suggested in several other answers. (Probably you do not w...
Message Queue vs Message Bus — what are the differences?
...ntly stemming from systems like IBM MQ and Tibco Rendezvous. MQ was originally a 1:1 system, indeed a queue to decouple various systems.
Tibco by contrast was (sold as a) messaging backbone, where you could have multiple publishers and subscribers on the same topics.
Both however (and newer compe...