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Insert, on duplicate update in PostgreSQL?

Several months ago I learned from an answer on Stack Overflow how to perform multiple updates at once in MySQL using the following syntax: ...
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What Makes a Good Unit Test? [closed]

I'm sure most of you are writing lots of automated tests and that you also have run into some common pitfalls when unit testing. ...
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Explanation of JSONB introduced by PostgreSQL

PostgreSQL just introduced JSONB and it's already trending on hacker news . It would be great if someone could explain how it's different from Hstore and JSON previously present in PostgreSQL. What are its advantages and limitations and when should someone consider using it? ...
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What does the restrict keyword mean in C++?

I was always unsure, what does the restrict keyword mean in C++? 6 Answers 6 ...
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Confused about Service vs Factory

As I understand it, when inside a factory I return an object that gets injected into a controller. When inside a service I am dealing with the object using this and not returning anything. ...
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How to insert a newline in front of a pattern?

How to insert a newline before a pattern within a line? 17 Answers 17 ...
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Is it possible to send a variable number of arguments to a JavaScript function?

Is it possible to send a variable number of arguments to a JavaScript function, from an array? 12 Answers ...
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When do Java generics require

Given the following example (using JUnit with Hamcrest matchers): 7 Answers 7 ...
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How to add an object to an array

How can I add an object to an array (in javascript or jquery)? For example, what is the problem with this code? 13 Answ...
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Useless use of cat?

This is probably in many FAQs - instead of using: 9 Answers 9 ...