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1. Multi-valued and composite attributes are allowed in ER diagram and model but not in relational model.
2. Many-to-one and one-to-many relationship sets that are total on the many-side can be represented by adding an extra attribute to the “many” side, containing the primary key of the “one” side. ( This way no extra table will be needed for Relationship sets )
3. If a relational schema is in BCNF then all redundancy based on functional dependency has been removed, although other types of redundancy may still exist.
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