Attributes - Definition - Designing the System

Q.  An entity in ER Model is a real world being, which has some properties called_____ .
- Published on 22 Jul 15

a. Attributes
b. Relationship
c. Domain
d. None of the above

ANSWER: Attributes

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    Discussion

  • Nirja Shah   -Posted on 15 Oct 15
    - The Entity-Relationship (ER) Model is based on the notion of real-world entities and relationships among them.

    - While creating a real-world scenario into the database model, the ER Model creates entity set, relationship set, general attributes and constraints.

    - We use the ER Model for the conceptual design of a database.

    Entity
    - It is a real world being, which has some properties called attributes.

    - Every attribute is defined by its corresponding set of values, called domain

    Relationship
    - The logical association among entities is called relationship.
    - Relationships are mapped with entities in various ways.
    - The number of association between two entities is known as mapping cardinalities

    - Different types of mapping cardinalities are:

    1. one to one
    2. one to many
    3. many to one
    4. many to many

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