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What's wrong with nullable columns in composite primary keys?
...ggested with nulls all traditional wisdom concerning equality goes out the window. Well that's how it seems at first glance.
But I don't think this is necessarily so and even SQL databases don't think that NULL destroys all possibility for comparison.
Run in your database the query
SELECT * FROM V...
source of historical stock data [closed]
...y have a ActiveX API which you can call with c++ code or C# or whatever in windows to get to your data.
– lukebuehler
Jun 23 '13 at 17:05
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Private virtual method in C++
...y answer, I think Sutter's guideline #3 rather shoves guideline #2 out the window.
– Spencer
Nov 9 '16 at 14:52
What i...
What is Unicode, UTF-8, UTF-16?
...d-width 16-bit encoding (UCS-2). Early adopters of Unicode, like Java and Windows NT, built their libraries around 16-bit strings.
Later, the scope of Unicode was expanded to include historical characters, which would require more than the 65,536 code points a 16-bit encoding would support. To al...
In Visual Studio C++, what are the memory allocation representations?
...'s C++ debugging heap to mark freed heap memory
* 0xDEADDEAD : A Microsoft Windows STOP Error code used when the user manually initiates the crash.
* 0xFDFDFDFD : Used by Microsoft's C++ debugging heap to mark "no man's land" guard bytes before and after allocated heap memory
* 0xFEEEFEEE : Used by ...
What is the difference between properties and attributes in HTML?
...tributes/properties and for properties which do not exist in html (such as window.location). All other attributes (ones you can see in the html) can and should continue to be manipulated with the .attr() method.
well actually you dont have to change something if you use attr or prop or both, both w...
Qt events and signal/slots
...he event loop. Each GUI program needs an event loop, whatever you write it Windows or Linux, using Qt, Win32 or any other GUI library. As well each thread has its own event loop. In Qt "GUI Event Loop" (which is the main loop of all Qt applications) is hidden, but you start it calling:
QApplication...
How do I profile memory usage in Python?
... resource is a Unix specific module that does not work under Windows.
– Martin
Nov 16 '16 at 11:16
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Domain Driven Design: Domain Service, Application Service
...mplementation for that ICache depends on the technology involved (ie. Web, Windows). Just because it's generic does not make it an application service. An application service is your domain's API. What if you wanted to reveal your domain to someone else writing an app, what will they use? Applicat...
How to read a .xlsx file using the pandas Library in iPython?
...works. It needs the dependency xlrd though. (pip3.7.4.exe install xlrd on Windows)
– Harry
May 13 at 15:27
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