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by MichaelMoser123 4580 days ago
I (mis)understand that the question is about unifying principles of computer science

by studying the subject one is supposed to learn how to think about layered computer systems; However upon closer study each layer turns out to be of very different nature; what has the network in common with the sql database?

Well, there here are several basic fields such as algorithms / data structures / some understanding of complexity, without them one can't really understand much of anything. So these are the bricks and mortar used in the field.