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What is causing ERROR: there is no unique constraint matching given keys for referenced table?
Below example table structure gives an ERROR: there is no unique constraint matching given keys for referenced table, and having stared at it for while now I can't figure out why this error arises in this situation.
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One SVN repository or many?
If you have multiple, unrelated projects, is it a good idea to put them in the same repository?
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Initializing a list to a known number of elements in Python [duplicate]
Right now I am using a list, and was expecting something like:
9 Answers
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How to download a file with Node.js (without using third-party libraries)?
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edited Jan 18 '19 at 17:16
user719662
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What is the idiomatic way to compose a URL or URI in Java?
How do I build a URL or a URI in Java? Is there an idiomatic way, or libraries that easily do this?
7 Answers
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What does the [Flags] Enum Attribute mean in C#?
...lues, rather than a single value. Such collections are often used with bitwise operators, for example:
var allowedColors = MyColor.Red | MyColor.Green | MyColor.Blue;
Note that the [Flags] attribute doesn't enable this by itself - all it does is allow a nice representation by the .ToString() meth...
Write a program that will surely go into deadlock [closed]
I recently got this questions asked in an interview.
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What is a stored procedure?
What is a "stored procedure" and how do they work?
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Python memoising/deferred lookup property decorator
Recently I've gone through an existing code base containing many classes where instance attributes reflect values stored in a database. I've refactored a lot of these attributes to have their database lookups be deferred, ie. not be initialised in the constructor but only upon first read. These attr...
problem with and :after with CSS in WebKit
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I haven't checked this extensively, but I'm under the impression that this isn't (yet?) possible, due to the way in which select elements are generated by the OS on which the browser runs, rather than the browser itself.
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