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Difference between natural join and inner join
What is the difference between a natural join and an inner join?
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Is it possible to for SQL Output clause to return a column not being inserted?
I've made some modifications to my database and I need to migrate the old data to the new tables. For that, I need to fill a table (ReportOptions) taking the data from the original table (Practice), and fill a second intermediate table (PracticeReportOption).
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Why are arrays covariant but generics are invariant?
From Effective Java by Joshua Bloch,
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How to call any method asynchronously in c#
Could someone please show me a small snippet of code which demonstrates how to call a method asynchronously in c#?
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What is the reason for performing a double fork when creating a daemon?
I'm trying to create a daemon in python. I've found the following question , which has some good resources in it which I am currently following, but I'm curious as to why a double fork is necessary. I've scratched around google and found plenty of resources declaring that one is necessary, but not ...
Why is XOR the default way to combine hashes?
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Assuming uniformly random (1-bit) inputs, the AND function output probability distribution is 75% 0 and 25% 1. Conversely, OR is 25% 0 and 75% 1.
The XOR function is 50% 0 and 50% 1, therefore it is good for combining uniform probabilit...
Shards and replicas in Elasticsearch
...rd and replica is in Elasticsearch, but I didn't manage to understand it. If I download Elasticsearch and run the script, then from what I know I have started a cluster with a single node. Now this node (my PC) have 5 shards (?) and some replicas (?).
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Does Python support multithreading? Can it speed up execution time?
I'm slightly confused about whether multithreading works in Python or not.
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Cross-browser custom styling for file upload button [duplicate]
I'm trying to style a file upload button to my personal preferences, but I couldn't find any really solid ways to do this without JS. I did find two other questions about this subject, but the answers there either involved JavaScript, or suggested Quirksmode's approach .
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When is a C++ destructor called?
...od in C++? I have been told that it is called whenever an object goes out of scope or is subjected to a delete
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