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How do I (or can I) SELECT DISTINCT on multiple columns?
I need to retrieve all rows from a table where 2 columns combined are all different. So I want all the sales that do not have any other sales that happened on the same day for the same price. The sales that are unique based on day and price will get updated to an active status.
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Why are side-effects modeled as monads in Haskell?
...lWorld)
-- input some states of the whole world,
-- modify the whole world because of the side effects,
-- then return the new world.
then f is pure again. We define a parametrized data type type IO a = RealWorld -> (a, RealWorld), so we don't need to type RealWorld so many times, and can just w...
Convert integer into byte array (Java)
what's a fast way to convert an Integer into a Byte Array ?
11 Answers
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How to initialize const member variable in a class?
When I am trying to initialize the const member variable t with 100. But it's giving me the following error:
11 Answers
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What's the difference between django OneToOneField and ForeignKey?
What's the difference between Django OneToOneField and ForeignKey ?
9 Answers
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How do I encode/decode HTML entities in Ruby?
I am trying to decode some HTML entities, such as '&amp;lt;' becoming '<' .
7 Answers
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A quick and easy way to join array elements with a separator (the opposite of split) in Java [duplic
... directly specifying the elements
String joined1 = String.join(",", "a", "b", "c");
2) using arrays
String[] array = new String[] { "a", "b", "c" };
String joined2 = String.join(",", array);
3) using iterables
List<String> list = Arrays.asList(array);
String joined3 = String.join(",", l...
Can you issue pull requests from the command line on GitHub?
It seems like you have to interact with github.com to initiate a pull request. Is this so?
9 Answers
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Haskell offline documentation?
What are the possibilities, if any, for getting offline docs for Haskell core libraries (and maybe more)?
9 Answers
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Is it possible to make abstract classes in Python?
How can I make a class or method abstract in Python?
12 Answers
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