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Why use multiple columns as primary keys (composite primary key)
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Your understanding is correct.
You would do this in many cases. One example is in a relationship like OrderHeader and OrderDetail. The PK in OrderHeader might be OrderNumber. The PK in OrderDetail might be OrderNumber AND LineNumber. If it was either of those two, it would not be unique...
Difference between wait() and sleep()
...g on the monitor) will wake up.
You can also call notifyAll if more than one thread is waiting on the monitor – this will wake all of them up. However, only one of the threads will be able to grab the monitor (remember that the wait is in a synchronized block) and carry on – the others will th...
How to parse a query string into a NameValueCollection in .NET
...hy to install 100 M of additional libraries on client computer to just use one simple method? However, it looks like Microsoft doesn't have any better idea. The only way is to implement own method or use open source implementation.
– Vitalii
Jun 1 '12 at 12:05
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Post parameter is always null
... I'm having some real odd issue when calling POST on my WebAPI.
I've even gone back to the basic version generated on new project. So:
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Where is git.exe located?
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why was this so difficult
– Jonesopolis
Aug 26 '14 at 16:19
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Its locate...
How do I detect when someone shakes an iPhone?
I want to react when somebody shakes the iPhone. I don't particularly care how they shake it, just that it was waved vigorously about for a split second. Does anyone know how to detect this?
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Checking for NULL pointer in C/C++ [closed]
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One important thing to note: until recently, I was in favor of writing "if (ptr)" instead of "if (ptr != NULL)" or "if (ptr != nullptr)" as it is more concise so it makes the code more readable. But I just found out that comp...
Window vs Page vs UserControl for WPF navigation?
..., but I cannot seem to get my head around what to use when redirecting someone to a new section of the application.
5 Answe...
How to choose between Hudson and Jenkins? [closed]
...ly, what is the direction each branch is taking and what are key points so one could make a choice between which to go with?
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What is the best way to convert an array to a hash in Ruby
In Ruby, given an array in one of the following forms...
11 Answers
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