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What does SQL clause “GROUP BY 1” mean?

Someone sent me a SQL query where the GROUP BY clause consisted of the statement: GROUP BY 1 . 6 Answers ...
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How do I create a datetime in Python from milliseconds?

I can create a similar Date object in Java by java.util.Date(milliseconds) . How do I create the comparable in Python? 5 A...
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Using Moq to mock an asynchronous method for a unit test

I am testing a method for a service that makes a Web API call. Using a normal HttpClient works fine for unit tests if I also run the web service (located in another project in the solution) locally. ...
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How to get the PATH environment-variable separator in Python?

When multiple directories need to be concatenated, as in an executable search path, there is an os-dependent separator character. For Windows it's ';' , for Linux it's ':' . Is there a way in Python to get which character to split on? ...
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SQLite Reset Primary Key Field

I have a few tables in SQLite and I am trying to figure out how to reset the auto-incremented database field. 4 Answers ...
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Escaping single quote in PHP when inserting into MySQL [duplicate]

...e it again, the string you get back from the database will not be automatically escaped for you. You'll get back "O'Brien". So, you will need to pass it through mysql_real_escape_string(). share | i...
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Create a File object in memory from a string in Java

I have a function that accepts File as an argument. I don't want to create/write a new File (I don't have write access to filesystem) in order to pass my string data to the function. I should add that the String data don't exist in a file (so I cannot read my data from a file). ...
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How do I check the operating system in Python?

I want to check the operating system (on the computer where the script runs). 5 Answers ...
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Regular expression to match a dot

...ch "test.this" from "blah blah blah test.this@gmail.com blah blah" is? Using Python. 6 Answers ...
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Copy table without copying data

copies the table foo and duplicates it as a new table called bar . 4 Answers 4 ...