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Difference between a theta join, equijoin and natural join
I'm having trouble understanding relational algebra when it comes to theta joins, equijoins and natural joins. Could someone please help me better understand it? If I use the = sign on a theta join is it exactly the same as just using a natural join?
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How to read lines of a file in Ruby
I was trying to use the following code to read lines from a file. But when reading a file , the contents are all in one line:
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What is the difference between “INNER JOIN” and “OUTER JOIN”?
Also how do LEFT JOIN , RIGHT JOIN and FULL JOIN fit in?
27 Answers
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Detect Browser Language in PHP
I use the following PHP script as index for my website.
12 Answers
12
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How do I sort unicode strings alphabetically in Python?
Python sorts by byte value by default, which means é comes after z and other equally funny things. What is the best way to sort alphabetically in Python?
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Finding three elements in an array whose sum is closest to a given number
Given an array of integers, A 1 , A 2 , ..., A n , including negatives and positives, and another integer S. Now we need to find three different integers in the array, whose sum is closest to the given integer S. If there exists more than one solution, any of them is ok.
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How do you test functions and closures for equality?
The book says that "functions and closures are reference types". So, how do you find out if the references are equal? == and === don't work.
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How to call a Python function from Node.js
I have an Express Node.js application, but I also have a machine learning algorithm to use in Python. Is there a way I can call Python functions from my Node.js application to make use of the power of machine learning libraries?
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Splitting on first occurrence
What would be the best way to split a string on the first occurrence of a delimiter?
5 Answers
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