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What is an entity supertype and subtype, and why is it used?
written 3.5 years ago by gravatar for DevarenjiniP DevarenjiniP • 3.2k •   modified 3.5 years ago
distributed databases
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written 3.5 years ago by gravatar for DevarenjiniP DevarenjiniP • 3.2k

Super types and Subtypes

  • An entity can be divided into serval subgroups or subtypes
  • An entity type that can be divided into subtypes is called super type.
  • A subtype is a subset ofasuper type that shares common attributes.
  • Subtypes behave in exactly the same way as any other entity type. …

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