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Hidden Features of SQL Server
... while deleted refers to the old values before the UPDATE:
UPDATE (table)
SET field1 = value1, field2 = value2
OUTPUT inserted.ID, deleted.field1, inserted.field1
WHERE (condition)
If a lot of info will be returned, the output of OUTPUT can also be redirected to a temporary table or a table varia...
Is there a performance difference between i++ and ++i in C?
Is there a performance difference between i++ and ++i if the resulting value is not used?
14 Answers
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Colspan/Rowspan for elements whose display is set to table-cell
...d 5 cells makes things tricky, because words stretches css-cells, overflow-settings doesn't seem to make difference. You also need to recalculate width for div.colspan>div>div.
– F-3000
Aug 16 '17 at 21:55
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What is the best workaround for the WCF client `using` block issue?
I like instantiating my WCF service clients within a using block as it's pretty much the standard way to use resources that implement IDisposable :
...
Multiple aggregations of the same column using pandas GroupBy.agg()
...
# '0.25.0.dev0+840.g989f912ee'
# Setup
df = pd.DataFrame({'kind': ['cat', 'dog', 'cat', 'dog'],
'height': [9.1, 6.0, 9.5, 34.0],
'weight': [7.9, 7.5, 9.9, 198.0]
})
df.groupby('kind').agg(
max_height=('height', 'max...
C++使用OLE/COM高速读写EXCEL的源码 - C/C++ - 清泛网 - 专注C/C++及内核技术
...yunhe/archive/2011/09/25/2190485.html
http://blog.sina.com.cn/s/blog_6e51df7f01015cci.html
感谢原作者的无私奉献。
通过VC实现对Excel表格的操作的方法有多种，如：通过ODBC数据库实现，通过解析Excel表格文件，通过OLE/COM的实现。本文主要研究通...
Operator Overloading with C# Extension Methods
... StringBuilder = sb; }
public StringBuilder StringBuilder { get; private set; }
public static implicit operator StringBuilderWrapper(StringBuilder sb) {
return new StringBuilderWrapper(sb);
}
public static StringBuilderWrapper operator +(StringBuilderWrapper sbw, string s) {
sbw...
How to count duplicate value in an array in javascript
...lke: The expression counts[x] || 0 returns the value of counts[x] if it is set, otherwise 0. Then just add one and set it again in the object and the count is done.
– Constantinius
Feb 7 '17 at 11:52
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How to normalize a NumPy array to within a certain range?
... default state. The argument copy performs the operation in-place if it is set to False. Documentation here.
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What is a “static” function in C?
...6.2.2/2 says that internal linkage behaves like in our example:
In the set of translation units and libraries that constitutes an entire program, each declaration of a particular identifier with external linkage denotes the same object or function. Within one translation unit, each declaration o...