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aizat fatin qila

Storyboard Text

  • AT SCHOOL
  • DATABASE SYSTEM: LAB2 : ENTITY RELATIONAL-MODEL
  • IN CLASS
  • An entity may be defined as a thing capable of an independent existence that can be uniquely identified. An entity is an abstraction from the complexities of a domain. When we speak of an entity, we normally speak of some aspect of the real world that can be distinguished from other aspects of the real world.
  • CONSUMER
  • BUYS
  • WRITER
  • Following are examples of ERD diagrams made in each system.
  • WRITES
  • NOVEL
  • ARTIST
  • TWO RELATED ENTITIES
  • PERFORM
  • SONG
  • An entity is a thing that exists either physically or logically. An entity may be a physical object such as a house. An event such  a customer transaction or order as logically.
  • DO YOU UNDERSTAND WHAT WE DO?
  • YES! A relationship captures how entities are related to one another. Relationships can be thought of as verbs, linking two or more nouns. 
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