ER diagram , Database Management System

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What is Primary key? Primary Key - Primary key is one of the candidate keys which uniquely identifies each row in the relation.

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Question 1: (a) Planning and management of ICT projects have a very poor record in developing countries. Briefly explain five critical success factors for correct implementa

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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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Consider the E/R schema with weak entity sets shown below. Come up with the SQL CREATE TABLE statements (with appropriate primary key, unique and foreign key constraints). Include

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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 B-Tree? A B-tree eliminates the redundant storage of search-key values .It permits search key values to appear only once.

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