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You aren't a fool; you're reinventing the wheel. This is something we all do. Recreating something that was previously created allows you to explore the topic much deeper. Those analysis skills will ...

Real systems are made over years and decades, by entire teams and divisions of engineers, in response to concrete pain points that someone needs solved. Nobody builds a skyscraper by himself. Don't be ...

You can do it in one query (if your IoTDB version supports subqueries): SELECT time, s1, s2, s3, s4 FROM root.sg.d1 WHERE s1 = (SELECT MAX(s1) FROM root.sg.d1); This returns all rows where s1 is at ...

This really did remind me: how could I possibly compare an undergraduate thesis project with the work of people who have spent more than a decade in the field? Anyone who does that is obviously a fool,...

It's impressive to have achieved what you did as an undergraduate. You should not evaluate your project by comparing it to mature RDBMS projects that in fact have thousands of engineer-years of work ...