normalization, Database Management System

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how to design tables

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What is foreign key? A relation schema r1 derived from an ER schema may contain among its attributes the primary key of another relation schema r2.this attribute is known as a

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What is the use of keyword ISA? The use of keyword ISA is to show that a class is a specialization of another class.

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What are shortcomings in structured approach? Structured methodology treats data and their behaviours separately, and this makes it harder to isolate changes. If changes are re

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