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I'd say this applies to virtually all best practices, patterns, architectures, etc. If you're doing something very simple, who cares about modularity or any kind of code hygiene? I don't. But what happens in reality? Simple and small systems or experiments grow, one little addition at a time, and we all know the mess that ensues.

So in my understanding, the question posed only applies to at least moderately complex systems, which is where engineering skills matter. And in that context, learning what distinguishes a good database design is obviously very valuable, not to say crucial.

> Nobody understands three lines of code of queries with left and right joins.

Not sure if you're being flippant, but a) this is not true, and more importantly b) why is it that we don't expect programmers to be at least as fluent in SQL as in other, less important, languages?






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