Every 3NF database can be further streamlined by including designer-added tables and keys.

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3NF (Third Normal Form) is a database schema design approach for relational databases which aims to reduce the duplication of data and ensure referential integrity by ensuring that it is in 1NF and 2NF and that all non-prime attributes are non-transitively dependent on every key of the table. Adding designer-added tables and keys does not streamline a 3NF database further in terms of normalization; instead, it might introduce redundancy or complexity. The next step in normalization after 3NF, if necessary, would be BCNF (Boyce-Codd Normal Form) or 4NF, focusing on resolving specific types of dependency and redundancy issues not addressed by 3NF.

Every 3NF Database Can Be Further Streamlined by Including Designer-Added