Explain in detail about data modelling, Software Engineering

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Explain in detail about data modelling.

Data modeling makes use of the ERD.
Having of 3 interrelated information.

The data object.

Attributes.

Relationships.

Cardinality and Modality

Cardinality is the specification of the number of occurrences of one object that can be related to the number of occurrences of another object.
One-to-one cardinality.
One-to-many cardinality.
Many-to-Many cardinality.
Modality of a relation is 0 if there is no explicit relationship or relation is optional.
Modality is 1 if an occurrence of relationship is mandatory.

Entity/Relationship Diagrams

Components are

Data Objects.

Attributes.

Relationships.

Several type indicators.

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