Consider two relations Order and Product with the schema Order (Oid, Odate, Pid, qty) and Product (Pid, manufacturer_id, unit_price). i) Can the Oid attribute in the relation Order be a candidate key of the relation? Justify your answer. ii) Can the Pid attribute in the relation Product be a candidate key of the relation? Justify your answer. iii) Find the candidate key for the relation Product.

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Enhanced ER Model

The enhanced ER model is an abbreviation for Enhanced Entity-Relationship (EER) model. As you know, the entity-relationship (ER) model is a pictorial illustration of the relationship between various entities of a domain. In the case of a large amount of data with multiple interrelated entities, the ER diagrams become complex and tough to interpret. For such cases, the need for enhancement in the ER model was observed, and thus, the EER model was designed.