FAQ on Database Management System

An extension of an entity type is specified as a collection of entities of a particular entity type that are grouped into an entity set. In the context of a database management system (DBMS), an extension of an entity type refers to the instances or occurrences of that entity type. For example, if you have … Read more

The entity set specifies the collection of all entities of a particular entity type in the database. An entity set is known as the set of all the entities which share the same properties. For example, a set of people, a set of students, a set of companies, etc. An entity set in the context … Read more

An entity type is specified as a collection of entities, having the same attributes. Entity type typically corresponds to one or several related tables in the database. A characteristic or trait which defines or uniquely identifies the entity is called entity type. For example, a student has student_id, department, and course as its characteristics. An … Read more

The Entity is a set of attributes in a database. An entity can be a real-world object which physically exists in this world. All the entities have their attribute which in the real world considered as the characteristics of the object. For example: In the employee database of a company, the employee, department, and the … Read more

E-R model is a short name for the Entity-Relationship model. This model is based on the real world. It contains necessary objects (known as entities) and the relationship among these objects. Here the primary objects are the entity, attribute of that entity, relationship set, an attribute of that relationship set can be mapped in the … Read more