Entity Sets >An entity is an object that exists and is distinguishable from other objects Example: specific person, company, event, plant P An entity set is a set of entities of the same type that share the same properties Example: set of all persons, companies, trees, holidays >An entity is represented by a set of attributes; i.e descriptive properties possessed by all members of an entity set Example instructor (ID name street sala course=(course id, title, credits) >A subset of the attributes form a primary key of the entity set; i.e., uniquely identifying each member of the setEntity Sets ➢An entity is an object that exists and is distinguishable from other objects. Example: specific person, company, event, plant ➢An entity set is a set of entities of the same type that share the same properties. Example: set of all persons, companies, trees, holidays ➢An entity is represented by a set of attributes; i.e., descriptive properties possessed by all members of an entity set. Example: instructor = (ID, name, street, city, salary ) course= (course_ id, title, credits) ➢A subset of the attributes form a primary key of the entity set; i.e., uniquely identifying each member of the set