COMPUTER APPLICATIONS
DATABASE MANAGEMENT SYSTEMS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Which of the following is a top-down approach in which the entity’s higher level can be divided into two lower sub-entities?
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Aggregation
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Generalization
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Specialization
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All of the above
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Explanation:
Detailed explanation-1: -Specialization is a top-down approach in which a higher-level entity is divided into multiple specialized lower-level entities.
Detailed explanation-2: -Generalization collects the common features of multiple entities to form a new entity. Specialization divides an entity to form multiple new entities that inherit some feature of the splitting entity. In Generalization, the higher level entity must have lower level entities.
Detailed explanation-3: -However, the data abstraction level that describes how the data was actually stored in the user’s machine (or system) is known as the Physical level.
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