what-is-an-entity-entity-type-and-entity-set explain with proper Diagram In RDBMS.
1.What is entity?
Ans/- An entity can be a real word object either animated or inanimate that can be easily identifiable.
Entity set: — An entity set is a group of similar kind of entities. It may contain entities with attributes sharing similar values. Entities are represents by their properties which also called attributes.
Weak entity: — A weak entity is a type of entity which doesn’t have its key attribute. It can be identified uniquely by considering by consisting primary key of another entity. It represented by double rectangular box. Weak relation represent by double diamond box.
Strong entity: — A strong entity is a type of entity which has its key attribute for that strong entity said need not to have participation.
Difference between strong and weak entity: -
