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What is the difference between varchar and varchar2 in Oracle?
...
Taken from the latest stable Oracle production version 12.2:
Data Types
The major difference is that VARCHAR2 is an internal data type and VARCHAR is an external data type. So we need to understand the difference between an internal and ext...
SQL Server: Make all UPPER case to Proper Case/Title Case
...END
SET @Index = @Index + 1
END
RETURN ISNULL(@OutputString,'')
END
Test calls:
select dbo.fnConvert_TitleCase(Upper('ÄÄ ÖÖ ÜÜ ÉÉ ØØ ĈĈ ÆÆ')) as test
select dbo.fnConvert_TitleCase(upper('Whatever the mind of man can conceive and believe, it can achieve. – Napoleon hill')) as...
Ideal Ruby project structure
... freewill
├── lib/
│ └── freewill.rb
├── test/
│ └── test_freewill.rb
├── README
├── Rakefile
└── freewill.gemspec
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How to know if user is logged in with passport.js?
... sessionStorage.removeItem("status");
};
function funcFail() { alert('Login method Failed'); };
};
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Force IE compatibility mode off using tags
... It is recommended that Web developers restrict their use of Edge mode to test pages and other non-production uses because of the possible unexpected results of rendering page content in future versions of Windows Internet Explorer.
I honestly don't entirely understand why. But according to this,...
Is there an alternative sleep function in C to milliseconds?
... Also note that when compiling with gcc -Wall -g3 -std=c11 -o sleep_test sleep_test.c && ./sleep_test on Linux Ubuntu, with gcc version 4.8.4, I get the following warning: warning: implicit declaration of function ‘usleep’ [-Wimplicit-function-declaration]. The solution is to add ...
C++ 读写xml方法整理（持续更新） - C/C++ - 清泛网 - 专注C/C++及内核技术
...tup.exe"));
pNewEle->SetAttribute(_T("force"), _T("0"));
doc.SaveFile("test.xml");
三、MSXML：
特点：Windows自带COM解析库，支持xsd规范（即xml不符合xsd规定格式，则加载失败报错）。
#import <msxml6.dll> named_guids
...
BOOL ParseXml::LoadXmlFile(M...
Binding a WPF ComboBox to a custom list
... {
((ConnectionViewModel)DataContext).PhonebookEntry = "test";
}
}
public class PhoneBookEntry
{
public string Name { get; set; }
public PhoneBookEntry(string name)
{
Name = name;
}
public override string T...
Is gcc 4.8 or earlier buggy about regular expressions?
... was added to 7+ as a result of this answer and is the GCC major version
Testing
You can test it with GCC like this:
cat << EOF | g++ --std=c++11 -x c++ - && ./a.out
#include <regex>
#if __cplusplus >= 201103L && \
(!defined(__GLIBC...
Is it possible to specify your own distance function using scikit-learn K-Means Clustering?
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print "%.0f msec" % ((time() - t0) * 1000)
# also ~/py/np/kmeans/test-kmeans.py
Some notes added 26mar 2012:
1) for cosine distance, first normalize all the data vectors to |X| = 1; then
cosinedistance( X, Y ) = 1 - X . Y = Euclidean distance |X - Y|^2 / 2
is fast. For bit vectors, k...