chapter 5, Database Management System

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Three Level Architecture of DBMS or Logical DBMS Architecture The logical architecture defines how data in the database is perceived by users. It is not deals with how the da

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What is a primary key? Primary key is chosen by the database designer as the principal means of identifying an entity in the entity set.

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Define the Attribute Inheritance The attributes of a higher level entity set are inherited through a lower level entity set made by specialization-generalization hierarchy. Nam

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What are the basic objects of the data dictionary? Tables Domains Data elements Structures Foreign Keys

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What is called mirroring? The simplest approach to introducing redundancy is to duplicate each disk. This method is called mirroring or shadowing.

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What is the difference between a HAVING CLAUSE and a WHERE CLAUSE? HAVING CLAUSE - HAVING CLAUSE is used only with SELECT statement. - It is normally used in a GROUP BY

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why are older data models are being replaced by new data models

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