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Loading Aggregate Root from Database with Validations

Here is a similar question Where to validate domain model rules that depend on database content? I am asking this new question because I have more descriptions and I don't want to change the ...
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How to model relationships in scenario where every product can (don't have to) be associated to only one category

This one still occupies my mind. How do you model 1:N relationships. Consider having a category and product (typical e-commerce scenario). Every product can (don't have to) be associated to only one ...
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Do aggregate-oriented NoSQL databases have advantages for implementing Real Time BI?

I am reading a book called "NoSQL distilled" by Martin Fowler and he writes: Aggregates can also be used to obtain analytics; for example, an aggregate update may fill in information on which ...