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Ruby on Rails: How can I revert a migration with rake db:migrate?
After installing devise MODEL User i got this.
9 Answers
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Formula to determine brightness of RGB color
I'm looking for some kind of formula or algorithm to determine the brightness of a color given the RGB values. I know it can't be as simple as adding the RGB values together and having higher sums be brighter, but I'm kind of at a loss as to where to start.
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Parse v. TryParse
What is the difference between Parse() and TryParse()?
8 Answers
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How to show all parents and subclasses of a class in IntelliJ IDEA?
When I'm editing a Java class in Eclipse, when my cursor is over a class variable, I can do Ctrl + T to have a popup that shows all its parents and subclasses. What is the equivalent in IntelliJ?
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What is the difference between UNION and UNION ALL?
What is the difference between UNION and UNION ALL ?
26 Answers
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What are “decorators” and how are they used?
I'm curious what exactly decorators are in AngularJS. There isn't much information online for decorators save for a blurb in the AngularJS documentation and a brief (albeit interesting) mention in a youtube video .
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Best way to clear a PHP array's values
Which is more efficient for clearing all values in an array? The first one would require me to use that function each time in the loop of the second example.
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How do I make a transparent canvas in html5?
How can I make a canvas transparent? I need to because I want to put two canvases on top of one another.
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What does |= (single pipe equal) and &=(single ampersand equal) mean
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C libcurl get output into a string
I want to store the result of this curl function in a variable, how can I do so?
4 Answers
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