ER diagram may be a graphical logical structure of info. It represents:

  • All the entities concerned with the logical structure.
  • Constituents of the entities.
  • Relationship between relation.
  • Type of mapping higher relations.

The symbols wont to draw Associate in Nursing ER diagram are:-

  • ER diagram stands for the Entity-Relationship diagram.
  • Entities area unit described by labeled rectangular boxes. The label is the name of the entity.
  • Weak entity sorts area unit described by double rectangular boxes.
  • Relationship sorts area unit described by diamond-shaped boxes.
  • A line connecting 2 entities represents a relationship. The name of the connection is written on top of the road.
  • Attributes area unit described by ellipses.
  • Key attributes have their names underlined.
  • Multivalued attributes area unit described by double ellipses.
  • Derived attributes area unit described by dotted ellipses.