With this title I'd expect a comparison regarding DRI and non-DRI objects (even with the DRI-indexes on the non-DRI objects). The first restriction is that with your implementation you can only have one to one relations because GUIDA is your primary-key.
From a maintenance point of view , I'd not want to take a look into your relations-table to see which tables are related and which are supposed to be related an which are not. Conclusion : nice shot, but needs more fundation.
Johan
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