Entity Sets

• An Entity Set is a set of entities of the same type that share the same properties, or attributes.

  • The set of cutomer entities for a bank could be described as the entity set “cutomers”
  • The entity set loan might be composed of all the loans awarded to customers by the bank.

• Entity sets do not have to be disjoint.

  • An entity may belong to more than one entity set.
  • “Swedish citizens” and “mammals” for instance.