Entity Classes and Attributes
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Entity Classes and Attributes

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Entity Classes and Attributes Entity Classes and Attributes Document Transcript

  • Entity Classes and AttributesEntity Class are represented by rectanglesAttributes are represented by ovalsKey attribute is represented by an underlineMultivalued attributes is represented with an oval with a double borderDerived attribute is represented with an oval dashed border -- Example the AGE from current -birthComposite attribute is represented with an oval that connects to additional ovalsRelationship Types and ConstraintsA relationship type is represented by a diamond and two connecting lines. The name of therelationship is shown inside the diamond. Reading the diagram from left to right to yields "a storeowns a video"..The name of the relationship type is a verb or verb phrase that describes the relationship.The alternate relationship name IsOwnedBy is the name of the relationship type when reading theother direction.