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DATABASE PRINCIPLE

A structured collection of related data
designed to manage large bodies of

information

DATABASE

Three Main Purposes of a Database

ORGANIZE, STORE, RETRIEVE

The most important purpose of DATABASE?

RETRIEVE

Method of storing and organizing computer files

FILE BASED SYSTEM

•An abstract model
•Describes how data are represented and

accessed

•Formally define data elements

•Relationships among data elements


What is this?

DATA MODEL

•A map of concepts and their relationship
•Describes the semantic of an organization

•Represent a series of assertions

•Describes the significance to organization;

entity classes, attributes and relationships

CONCEPTUAL DATA MODEL

What are the three elements of hierarchical data model

•Root: highest-level data, data retrieval
•Node: middle-level data, parent and child

•Leaf: terminal data, end node

It Organizes data using two fundamental
constructs:

•Records - Contains fields

•Sets - Define one-to-one relationships between records •One owner, many members

NETWORK DATA MODEL

•First-order predicate logic
•Collections of predicates over a finite

set

•Describing constraints on possible

value, combination of values


WHAT IS THIS?

RELATIONAL DATA MODEL

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