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Multiplicity Is The Same As What Concept For An ERD?

Question

Multiplicity Is The Same As What Concept For An ERD?

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Solution

Multiplicity in an Entity-Relationship Diagram (ERD) is the same as the concept of Cardinality.

Here are the steps to understand this concept:

  1. ERD: An Entity-Relationship Diagram (ERD) is a type of structural diagram for use in database design. It provides a graphical representation of the logical structure of a database.

  2. Multiplicity: Multiplicity in an ERD refers to the number of instances in one entity class that can (or must) be associated with instances in another entity class.

  3. Cardinality: Cardinality is a term used in database design that refers to the uniqueness of data values contained in a particular column (attribute) of a database table. The cardinality of a column is the number of unique values that it can contain.

  4. Multiplicity = Cardinality: In the context of an ERD, multiplicity is often used interchangeably with the term "cardinality". Both terms refer to the relationships between entities. For example, one-to-one, one-to-many, and many-to-many are types of cardinality that describe how instances of entities relate to each other.

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Similar Questions

In a class diagram, what does the term "multiplicity" refer to?a.The number of instances of a class that can be related to another classb.The number of methods within a classc.The number of associations between classesd.The number of attributes within a class

Select the incorrect statementSelect one:Multiplicity is a constraint that specifies the range of permitted cardinalities, for example in an association role or in a composite class.A whole–part association between two or more objects, where one represents the whole and the other parts of that whole.Specialization is the abstraction of common feature among elements by the creation of a hierarchy of more general elements that encapsulate common features.

Describe three key components of an ERD.

In a class diagram, what does a multiplicity of "1..*" indicate for an association?a.One-to-many relationshipb.Many-to-many relationshipc.Many-to-one relationshipd.One-to-one relationship

What does multiplicity in a class diagram represent?Mark(Choose one option)The number of methods within a class.The maximum number of classes in a diagram.The number of attributes a class must have.The number of instances one class can relate to in another class.

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