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Create unique constraint with null columns
...or may not be useful. In extreme situations it might even help to maintain all three indexes (the two partial ones and a total on top).
Aside: I advise not to use mixed case identifiers in PostgreSQL.
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Android SDK manager won't open
So I installed the android sdk for Windows:
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Format date to MM/dd/yyyy in JavaScript [duplicate]
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that's not actually MM/dd/yyyy. That's M/d/yyyy. Does your date need leading zeros?
– Ray Wadkins
Sep 25 '13 at 21:25
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How to Convert JSON object to Custom C# object?
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Since we all love one liners code
Newtonsoft is faster than java script serializer.
... this one depends on the Newtonsoft NuGet package, which is popular and better than the default serializer.
if we have class then use below.
My...
Rails: around_* callbacks
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Abram
32.7k2424 gold badges115115 silver badges160160 bronze badges
answered Feb 14 '11 at 23:44
Pan Thomak...
How to delete (not cut) in Vim?
...ing.
– JShorthouse
Dec 16 '19 at 17:32
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Ways to implement data versioning in MongoDB
... approach would be to store diffs. Because the display of these diffs is really a special action, I would put the diffs in a different "history" collection.
I would use the different collection to save memory space. You generally don't want a full history for a simple query. So by keeping the histo...
No compiler is provided in this environment. Perhaps you are running on a JRE rather than a JDK?
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On your Eclipse IDE, go into Window > Preferences > Java > Installed JREs > and check your installed JREs. You should have an entry with a JDK there.
Select the Execution Env as show below. Click OK
Then Right-Click on your Project -> Maven -> Update Project
Additionally, yo...
What is SuppressWarnings (“unchecked”) in Java?
...to, and you need to effectively tell the compiler that what you're doing really will be legal at execution time.
I usually find this a pain when I'm mocking a generic interface, but there are other examples too. It's usually worth trying to work out a way of avoiding the warning rather than suppres...
How can I select random files from a directory in bash?
...are 100% safe regarding files with spaces and funny symbols in their name. All of them will populate an array randf with a list of random files. This array is easily printed with printf '%s\n' "${randf[@]}" if needed.
This one will possibly output the same file several times, and N needs to be kno...