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what relations does a relational db not help with? (i thought they were basically an implementation of the relational model).

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Being a child of, being included in...

You can of course manage all those relations in a relational database but the job is done by you, not by the database.

but isn't the point of being able to implement any relationship you want rather than having a few particular kinds (child of, included in) "built in" a feature? are you going to extend your database every time someone wants a different kind of relationship?

Yes, but usual relations could be implemented by default and generic relation still be available.

I just want to test this and see if the database can do more and my code less.

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