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Do I need to create indexes on foreign keys on Oracle?
I have a table A and a table B . A has a foreign key to B on B 's primary key, B_ID .
7 Answers
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How to perform element-wise multiplication of two lists?
... to perform an element wise multiplication, to multiply two lists together by value in Python, like we can do it in Matlab.
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How to deal with SettingWithCopyWarning in Pandas?
...larly when the first selection returns a copy. [see GH5390 and GH5597 for background discussion.]
df[df['A'] > 2]['B'] = new_val # new_val not set in df
The warning offers a suggestion to rewrite as follows:
df.loc[df['A'] > 2, 'B'] = new_val
However, this doesn't fit your usage, which...
How may I sort a list alphabetically using jQuery?
I'm a bit out of my depth here and I'm hoping this is actually possible.
10 Answers
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C# 'is' operator performance
...erformance. Within one of its inner loops, I need to test the type of an object to see whether it inherits from a certain interface.
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Can two different strings generate the same MD5 hash code?
For each of our binary assets we generate a MD5 hash. This is used to check whether a certain binary asset is already in our application. But is it possible that two different binary assets generate the same MD5 hash. So is it possible that two different strings generate the same MD5 hash?
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Function passed as template argument
... << "Result is " << temp << std::endl;
}
which can now be called as either:
doOperation(add2);
doOperation(add3());
See it live
The problem with this is that if it makes it tricky for the compiler to inline the call to add2, since all the compiler knows is that a function poi...
How do you make an array of structs in C?
...rying to make an array of structs where each struct represents a celestial body.
7 Answers
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Creating range in JavaScript - strange syntax
...pe.apply handles arguments
How Array handles multiple arguments
How the Number function handles arguments
What Function.prototype.call does
They're rather advanced topics in javascript, so this will be more-than-rather long. We'll start from the top. Buckle up!
1. Why not just Array(5).map?
What...
Forward declaration of a typedef in C++
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You can do forward typedef. But to do
typedef A B;
you must first forward declare A:
class A;
typedef A B;
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