cognitive psychology. PhD 
A (group) blog post on our new work on data organization—the OTHER kind of "data structure", but is rarely ever talked about in CS ed. Connections to diversity, computational thinking, and theories of perception! https://blog.brownplt.org/2020/06/27/data-org.html …
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Which question specifically is SQL vs MongoDB? There are lots of "questions" in the paper, so not sure.
As in the two scenarios, Travel/Games. They compare a single datatype with nested lists (Mongo) vs. two datatypes with foreign keys (SQL). That's exactly the kind of data representation tradeoff a db eng has to consider comparing a document database vs. relational database.
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Ah, yes, that is very much similar. We're in concordance. I've had trouble finding DB education literature on these kinds of issues, which is mind-boggling (and presumably reflective of my inability to find literature).
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I learned most of my "data modeling" on the job. That seems to be how most people have learned it (and being told that "third normal form" is good), and also how most people seem to learn API design. 1/2
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