E r diagram

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E r diagram

  1. 1. Entity-Relationship Diagram
  2. 2.  Conceptual Data Model) E-R
  3. 3.
  4. 4. Strong entityWeak entityAssociative entity*
  5. 5.
  6. 6. Single-valued attributeMulti valued attributeDerived attribute
  7. 7. Simple AttributeComposite Attribute
  8. 8.
  9. 9. RelationshipIdentifying Relationship
  10. 10. Unary entity instance entity type
  11. 11. Binary entity instance 2 entity type
  12. 12. Ternary entity instance 3 entity type
  13. 13.   Cardinality Constraints  Participation Constraints
  14. 14.  3  One-to-one relationship  One-to-many relationship  many-to-many relationship
  15. 15.  One-to-one relationship 1 1
  16. 16.  One-to-many relationship 1 M
  17. 17.  many-to-many relationship M N
  18. 18.   Total Participation ( )  Partial Participation ( ) Total Participation Partial Participation M N
  19. 19. 
  20. 20.  Entity Relationship Diagram Primary key
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