Entity/Relationship Model Entity like objects,=things Entity set like class set of similar Entity or objects Attribute=property of entities in an entity set,similar to fields of a struct. Relation=connect two or more entity set In diagrams, entity set rectangle; attribute:oval, relation:diamonds 55 Entity/Relationship Model † Entity like objects, =things † Entity set like class = set of similar Entity or objects † Attribute=property of entities in an entity set, similar to fields of a struct. † Relation=connect two or more entity set In diagrams, entity set : rectangle; attribute: oval, relation: diamonds