Discussion
Which amongst the following is an example of object based logical model ?
Answer: C
The object-based logical model is the Entity Relationship Model.
Korth and Silberschatz divide data models into object-based logical models, record-based logical models and physical models. Object-based models describe data in terms of objects (entities) and their relationships; the entity-relationship model and the object-oriented model are the standard examples.
The network, hierarchical and relational models are record-based logical models: the database is structured as fixed-format records of several types, linked by pointers in the first two and by values in tables in the relational model.
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