Discuss in detail about data modeling, Software Engineering

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Discuss in detail about data modeling.

Data modelling makes use of the ERD.
Consists of three interconnected information.

The data object.

Attributes.

Relationships.

Cardinality and Modality

Cardinality means the specification of the number of occurrences of one object that can be linked 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 when no explicit relationship or relation is optional.
Modality is 1 when occurrence of relationship is mandatory.

Entity/Relationship Diagrams

Elements are

Data Objects.

Attributes.

Relationships.

Various type indicators.

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