I suggest the next step. How to run some query on Chapter referencing
to the property in Book, E.g Book is having a 'Genre', Chapter is
having a 'Number' and query: find all Chapter number 4 in Books being
of genre 'Fiction'. And two ways how to resolve this query:
- keeping scheme normalized: multiply queries and filtering in memory
- break normalization dogma: move 'Genre' property to Chapter and run
one single query.
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