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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