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Select first row in each GROUP BY group?
...i+ as originally stated), SQL Server 2005+, PostgreSQL 8.4+, DB2, Firebird 3.0+, Teradata, Sybase, Vertica:
WITH summary AS (
SELECT p.id,
p.customer,
p.total,
ROW_NUMBER() OVER(PARTITION BY p.customer
ORDER BY p.total DESC) ...
Apply pandas function to column to create multiple new columns?
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How to delete all files and folders in a directory?
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gsharpgsharp
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How to keep the console window open in Visual C++?
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392
Start the project with Ctrl+F5 instead of just F5.
The console window will now stay open with...
How to set java_home on Windows 7?
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edited Mar 31 at 1:41
KarSho
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an...
Why is a pure virtual function initialized by 0?
...This is described in his book, The Design & Evolution of C++, section 13.2.3:
The curious =0 syntax was chosen ...
because at the time I saw no chance of
getting a new keyword accepted.
He also states explicitly that this need not set the vtable entry to NULL, and that doing so is not ...
Efficient way to insert a number into a sorted array of numbers?
...ements into an array of 1000:
First Method:
1 milliseconds
Second Method:
34 milliseconds
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C99 stdint.h header and MS Visual Studio
... just discovered that the C99 stdint.h is missing from MS Visual Studio 2003 upwards. I'm sure they have their reasons, but does anyone know where I can download a copy? Without this header I have no definitions for useful types such as uint32_t, etc.
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How to remove single character from a String
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231
You can also use the StringBuilder class which is mutable.
StringBuilder sb = new StringBuilde...
Why would I ever use push_back instead of emplace_back?
...e Deduction in C++14. I start talking about push_back vs. emplace_back at 13:49, but there is useful information that provides some supporting evidence prior to that.
The real primary difference has to do with implicit vs. explicit constructors. Consider the case where we have a single argument tha...