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Tuesday, 3 July 2018

In constructing ER diagrams, the double ovals are used to denote

  By GK Planet Team       Tuesday, 3 July 2018
Q. In constructing ER diagrams, the double ovals are used to denote
  1. multi-value table
  2. multi-value entity
  3. multi-value attributes
  4. multi-value key
Answer: Multi-valued attributes

An Entity Relationship (ER) Diagram is a type of flowchart that illustrates how “entities” such as people, objects or concepts relate to each other within a system.
Any object, for example, entities, attributes of an entity, relationship sets, and attributes of relationship sets, can be represented with the help of an ER diagram.

  • Entities are represented by means of rectangles.
  • Attributes are the properties of entities. Attributes are represented by means of ellipses.
  • Multivalued attributes are depicted by the double ellipse.
  • Derived attributes are depicted by dashed ellipse.
  • Relationships are represented by the diamond-shaped box.
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