Entity Relationship Diagram (ERD)

An entity is a

• object of relation

• present working model

• thing in real world

• model of relation

Which of the following is not a component of ER Model in DBMS?

• entity

• database

• attribute

• relationship

A relationship is

• an item in an application

• a meaningful dependency between entities

• a collection of related entities

• a related data

Entity is represented as

• ellipse

• double ellipse

• rectangle

• double rectangle

Property that describes the characteristics of entity is

• entities

• relationship

• attributes

• identifiers

Entities can be associated with one another in which of the following

• attribute

• identifiers

• entities

• relationship

Rows of a relation is called

• a relation row

• an entity

• a data structure

• tuples

In ER diagram relationships is represented by

• circles

• rectangles

• ellipse

• diamond shaped box

One entity may be

• related to only one other entity

• related to itself

• related to only two other entities

• related to many other entities

For a weak entity type to be meaningful, it must be associated with another entity type called

• Identifying type

• Owner set

• Neighbour set

• Strong entity set