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What is the difference between “INNER JOIN” and “OUTER JOIN”?
... with no duplicates, which is a very common case:
An inner join of A and B gives the result of A intersect B, i.e. the inner part of a Venn diagram intersection.
An outer join of A and B gives the results of A union B, i.e. the outer parts of a Venn diagram union.
Examples
Suppose you have two ...
is vs typeof
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This should answer that question, and then some.
The second line, if (obj.GetType() == typeof(ClassA)) {}, is faster, for those that don't want to read the article.
(Be aware that they don't do the same thing)
share
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How does `is_base_of` work?
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If they are related
Let's for a moment assume that B is actually a base of D. Then for the call to check, both versions are viable because Host can be converted to D* and B*. It's a user defined conversion sequence as described by 13.3.3.1.2 from Host<B, D> to D* and B*...
How can we match a^n b^n with Java regex?
... to say, YES! You can most certainly write a Java regex pattern to match anbn. It uses a positive lookahead for assertion, and one nested reference for "counting".
Rather than immediately giving out the pattern, this answer will guide readers through the process of deriving it. Various hints are giv...
What is the difference between instanceof and Class.isAssignableFrom(…)?
Which of the following is better?
14 Answers
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What is object slicing?
Someone mentioned it in the IRC as the slicing problem.
18 Answers
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What does ||= (or-equals) mean in Ruby?
What does the following code mean in Ruby?
23 Answers
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Modulo operation with negative numbers
In a C program i was trying the below operations(Just to check the behavior )
12 Answers
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Ruby: How to turn a hash into HTTP parameters?
... from the gem.
Julien, your self-answer is a good one, and I've shameless borrowed from it, but it doesn't properly escape reserved characters, and there are a few other edge cases where it breaks down.
require "addressable/uri"
uri = Addressable::URI.new
uri.query_values = {:a => "a", :b =>...
Java rounding up to an int using Math.ceil
...57/32 = 4.90625 , I need to round up, I've looked around and this seems to be the right method.
15 Answers
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