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What's the best practice for primary keys in tables?
When designing tables, I've developed a habit of having one column that is unique and that I make the primary key. This is achieved in three ways depending on requirements:
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How to find the nearest parent of a Git branch?
Let's say I have the following local repository with a commit tree like this:
20 Answers
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How to show and update echo on same line
I have the following in Bash (In Linux)
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Reshape three column data frame to matrix (“long” to “wide” format) [duplicate]
I have a data.frame that looks like this.
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Random “Element is no longer attached to the DOM” StaleElementReferenceException
I'm hoping it's just me, but Selenium Webdriver seems like a complete nightmare. The Chrome webdriver is currently unusable, and the other drivers are quite unreliable, or so it seems. I am battling many problems, but here is one.
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Ruby class instance variable vs. class variable
I read " When do Ruby instance variables get set? " but I'm of two minds when to use class instance variables.
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JPA EntityManager: Why use persist() over merge()?
EntityManager.merge() can insert new objects and update existing ones.
15 Answers
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What is @RenderSection in asp.net MVC
What is the purpose of @RenderSection and how does it function? I understand what bundles do, but I have yet to figure out what this does and it's probably important.
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Algorithm to detect intersection of two rectangles?
I'm looking for an algorithm to detect if two rectangles intersect (one at an arbitrary angle, the other with only vertical/horizontal lines).
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Random float number generation
How do I generate random floats in C++?
14 Answers
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