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Basic Concepts of Entity-Relationship Model

Neso Academy・7 minutes read

The Entity Relationship Model (ER Model) defines data with entities, attributes, and relationships, with entities representing real-world things and attributes detailing properties. Attributes encompass various types like composite, simple, single-valued, multi-valued, derived, and stored, with null values indicating not applicable or unknown information.

Insights

  • The Entity Relationship Model (ER Model) categorizes data into entities, attributes, and relationships, providing a structured way to understand and represent complex information systems.
  • Attributes play a crucial role in defining entities by describing their properties, with various types like composite, simple, single-valued, multi-valued, derived, and stored, each serving a distinct purpose in data modeling and analysis.

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Recent questions

  • What is the Entity Relationship Model?

    A conceptual model describing data entities, attributes, relationships.

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Summary

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Understanding the Entity Relationship Model in Data

  • The Entity Relationship Model (ER Model) describes data as entities, attributes, and relationships.
  • Entities are things in the real world with independent existence, such as objects with physical or conceptual existence.
  • Attributes are properties that describe entities, like name, age, address, etc.
  • Types of attributes include composite (dividable), simple (indivisible), single-valued (one value), multi-valued (set of values), derived (from other attributes), and stored (value source).
  • Null values in attributes can signify not applicable or unknown information, with unknown further classified into missing or existence uncertainty.
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