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Simple way to calculate median with MySQL
... @rownum:=0) r
WHERE d.val is NOT NULL
-- put some where clause here
ORDER BY d.val
) as dd
WHERE dd.row_number IN ( FLOOR((@total_rows+1)/2), FLOOR((@total_rows+2)/2) );
Steve Cohen points out, that after the first pass, @rownum will contain the total number of rows. This can be used to de...
How to use localization in C#
... strings.fr-CA.resx.
The string to be used is determined in this priority order:
From country-specific resource like strings.fr-CA.resx
From language-specific resource like strings.fr.resx
From default strings.resx
Note that language-specific resources generate satellite assemblies.
Also learn...
How can I get nth element from a list?
...6
|
`- 7
We can now access the elements of the tree in depth-first order:
> tree ^? element 0
Just 1
> tree ^? element 1
Just 2
> tree ^? element 2
Just 4
> tree ^? element 3
Just 5
> tree ^? element 4
Just 3
> tree ^? element 5
Just 6
> tree ^? element 6
Just 7
We ca...
Rails “validates_uniqueness_of” Case Sensitivity
...hreaded server. That's because you might get this sequence of events (the order is important):
Process A gets a request to create a new user with the name 'foo'
Process B does the same thing
Process A validates the uniqueness of 'foo' by asking the DB if that name exists yet and the DB says the n...
Why NSUserDefaults failed to save NSMutableDictionary in iOS?
...e all of your keys in the dictionary NSStrings? I think they have to be in order to save the dictionary to a property list.
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How does tuple comparison work in Python?
...(1,2) is false because the type is not the same).
Collections that support order comparison are ordered the same as their first unequal elements (for example, [1,2,x] <= [1,2,y] has the same value as x <= y). If a corresponding element does not exist, the shorter collection is ordered first (f...
Putting git hooks into repository
...t is created.
The template directory will be one of the following (in order):
the argument given with the --template option;
the contents of the $GIT_TEMPLATE_DIR environment variable;
the init.templateDir configuration variable; or
the default template directory: /usr/share/git-c...
When should I use Lazy?
...ou have an entity Customer which has properties for Name, PhoneNumber, and Orders. Name and PhoneNumber are regular strings but Orders is a navigation property that returns a list of every order the customer ever made.
You often might want to go through all your customer's and get their name and ph...
What is “with (nolock)” in SQL Server?
...r 2005, so the support for NOLOCK exists if you are using that version. In order to future-proof you code (assuming you've decided to use dirty reads) you could use this in your stored procedures:
SET TRANSACTION ISOLATION LEVEL READ UNCOMMITTED
Why does C++ not allow inherited friendship?
...e that the interface class A has to boilerplate call wrappers to Z, and in order to extend access to subclasses, A's boilerplate has to be essentially duplicated in every base class like B. An interface normally expresses what functionality a module wants to offer, not what functionality in others ...