DATABASE FUNDAMENTALS
WHAT IS DATABASE MANAGEMENT
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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The External Model
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Object-Oriented Model
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The Conceptual Model
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The Internal Model
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Detailed explanation-1: -The external model is the representation of the database as “seen” by the DBMS. The hierarchical model is software-independent. The relational model is hardware-dependent and software-independent.
Detailed explanation-2: -(The internal model is the representation of a database as “seen” by the DBMS. In other words, the internal model requires a designer to match the conceptual model’s characteristics and constraints to those of the selected implementation model.)
Detailed explanation-3: -The Conceptual/ Internal Mapping lies between the conceptual level and the internal level. Its role is to define the correspondence between the records and fields of the conceptual level and files and data structures of the internal level.
Detailed explanation-4: -Representational data model is also called implementation data model because it is neither so difficult to understand for the end user nor at the same time it is not far from how the data is stored on the computer storage.