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Can I add a UNIQUE constraint to a PostgreSQL table, after it's already created?
...ing constraints based on lets say: name and lastname and you wanted to add one more unique constraint, you had to drop the entire constrain by:
ALTER TABLE your_table DROP CONSTRAINT constraint_name;
Make sure tha the new constraint you wanted to add is unique/ not null ( if its Microsoft Sql, it...
How can I make a JUnit Test wait?
... rely on timing (use mocks) or use libraries such as Awaitility for asynchroneous testing.
– FuryFart
Mar 14 '19 at 15:07
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Why isn't there a Guid.IsNullOrEmpty() method
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For one thing, Guid is not nullable. You could check:
myGuid == default(Guid)
which is equivalent to:
myGuid == Guid.Empty
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How to get time difference in minutes in PHP
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Subtract the past most one from the future most one and divide by 60.
Times are done in Unix format so they're just a big number showing the number of seconds from January 1, 1970, 00:00:00 GMT
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PHP filesize MB/KB conversion [duplicate]
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Nice one. Keep it up
– Prabhu Nandan Kumar
Feb 26 '19 at 10:11
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What is the difference between a directory and a folder?
... between versions of Windows, and between individual installations. ...
If one is referring to a container of documents, the term folder is more appropriate. The term directory refers to the way a structured list of document files and folders is stored on the computer. The distinction can be due to ...
Iteration over std::vector: unsigned vs signed index variable
...able. try iterator_traits<element_type*>::difference_type. this is one mouthful of a declaration, but it is more portable...
– wilhelmtell
Jan 4 '09 at 4:48
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How do you usually Tag log entries? (android)
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As mentioned by Ralph Mueller, this technique does not work if you use Proguard (as most Android projects do) to obfuscate the class names.
– John Patterson
Apr 28 '14 at 22:55
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How to quickly open a file in Visual Studio 2012
I am trying VS2012 RC but find one good feature no available any more (or if it still is, please let me know): in VS2010, if I know a file name, for example, MyFile.cs , I can quickly open it by typing Ctrl + D (or whatever shortcut assigned) to go to Find tool, and then type >of myfile.cs , ...
Get file version in PowerShell
... Although the other answers give shorter commands, all of the ones I tried print out too much info and truncate the file path to "...". The 2nd command in this answer gives just what you need, works for a directory of files, and is formatting in a way that it's easy to see how to modify...