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Return 0 if field is null in MySQL
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Use IFNULL:
IFNULL(em>x m>pr1, 0)
From the documentation:
If em>x m>pr1 is not NULL, IFNULL() returns em>x m>pr1; otherwise it returns em>x m>pr2. IFNULL() returns a numeric or string value, depending on the contem>x m>t in which it is used.
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Rails Model find where not equal
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In Rails 4.m>x m> (See http://edgeguides.rubyonrails.org/active_record_querying.html#not-conditions)
GroupUser.where.not(user_id: me)
In Rails 3.m>x m>
GroupUser.where(GroupUser.arel_table[:user_id].not_eq(me))
To shorten the length, you co...
What is so special about Generic.m>x m>aml?
.... on Vista using the Aero theme, the dictionary is called Aero.NormalColor.m>x m>aml, on m>X m>P using the default theme it is Luna.NormalColor.m>x m>aml. If the style is not found in the theme dictionary, it looks in Generic.m>x m>aml i.e for controls whose look doesn't depend on the theme.
This only applies to any c...
Error installing mysql2: Failed to build gem native em>x m>tension
...d other distributions using yum:
sudo yum install mysql-devel
On Mac OS m>X m> with Homebrew:
brew install mysql
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public friend swap member function
...here is! We can use a friend function, and find it through ADL:
namespace m>x m>yz
{
struct myclass
{
friend void swap(myclass&, myclass&);
};
}
When we want to swap something, we associate† std::swap and then make an unqualified call:
using std::swap; // allow use of st...
What is a Lambda?
... the secrets of C# question, but I have yet to find a good definition and em>x m>planation of what they are in the first place.
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Python base64 data decode
...g piece of base64 encoded data, and I want to use python base64 module to em>x m>tract information from it. It seems that module does not work. Can anyone tell me how?
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How to dynamically build a JSON object with Python?
...ld like to dynamically build a JSON object by adding some key-value to an em>x m>isting JSON object.
5 Answers
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How do I get monitor resolution in Python?
... @StevenVascellaro The width/height of the virtual screen, in pim>x m>els. msdn.microsoft.com/en-us/library/windows/desktop/…
– Derek
Jul 30 '18 at 20:42
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MAC addresses in JavaScript
I know that we can get the MAC address of a user via IE (Activem>X m> objects).
6 Answers
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