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Can a foreign key be NULL and/or duplicate?
...inition. Null by definition is not a value. Null means that we do not yet know what the value is.
Let me give you a real life example. Suppose you have a database that stores sales proposals. Suppose further that each proposal only has one sales person assigned and one client. So your proposal tab...
How to split a string, but also keep the delimiters?
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You won the challenge ! Errr... congratulation! As you know, from the code-challenge thread, there would be no special points or badges for that... (sigh): stackoverflow.com/questions/172184. But thank you for this contribution.
– VonC
Nov 10...
How to execute Python scripts in Windows?
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When you execute a script without typing "python" in front, you need to know two things about how Windows invokes the program. First is to find out what kind of file Windows thinks it is:
C:\>assoc .py
.py=Python.File
Next, you need to know how Windows is executing things with tha...
Force HTML5 youtube video
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hmm - now it's not working (same vids), weird. I wonder if it only works on certain youtube servers?
– UpTheCreek
Mar 3 '12 at 13:02
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Spring MVC @PathVariable with dot (.) is getting truncated
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As far as i know this issue appears only for the pathvariable at the end of the requestmapping.
We were able to solve that by defining the regex addon in the requestmapping.
/somepath/{variable:.+}
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How to convert a selection to lowercase or uppercase in Sublime Text
...or lowercase.
Method 1 (Two keys pressed at a time)
Press Ctrl and hold.
Now press K, release K while holding Ctrl. (Do not release the Ctrl key)
Immediately, press U (for uppercase) OR L (for lowercase) with Ctrl still being pressed, then release all pressed keys.
Method 2 (3 keys pressed at a t...
Form inside a form, is that alright? [duplicate]
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This is good to know. I've implemented it in the past with custom data attributes and javascript when I could have just included a html5 shim library.
– Jon Hulka
Mar 22 '17 at 18:10
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How to show math equations in general github's markdown(not github's blog)
...are shown the same while they are actually different. Would you happen to know why it happens?
– Sam
Feb 17 '14 at 4:13
3
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Difference between android.app.Fragment and android.support.v4.app.Fragment
... use android.app.Fragment.
Edit: the OS-contained android.app.Fragment is now deprecated (as of API level 28), and everyone should move to using the support library implementations.
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How do I view an older version of an SVN file?
I have an SVN file which is now missing some logic and so I need to go back about 40 revisions to the time when it had the logic I need. Other than trying to view a diff of the file in the command line ( very hard to read ), is there any way I could get a copy of that file to review so I can study i...