What are the three elements of the data model

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The three elements of a data model are data structure, data manipulation, and data constraints. Data model is the abstraction of data characteristics, which describes the static characteristics, dynamic behavior and constraints of the system from the abstract level, and provides an abstract framework for the information representation and operation of database system.

Introduction:

The three elements of a data model are data structure, data manipulation, and data constraints. Data model is the abstraction of data characteristics, which describes the static characteristics, dynamic behavior and constraints of the system from the abstract level, and provides an abstract framework for the information representation and operation of database system.

Details:

Data Model is the abstraction of data characteristics, which describes the static characteristics, dynamic behaviors and constraints of the system from the abstract level, and provides an abstract framework for the information representation and operation of database systems.

The content described by data model includes three parts: data structure, data operation and data constraint.

Data structure: The data structure in the data model mainly describes the type, content, nature and relationship between data. Data structure is the foundation of data model, and data operations and constraints are built on data structure. Different data structures have different operations and constraints.

Data operations: Data operations in the data model mainly describe the operation types and operation modes on the corresponding data structures.

Data constraints: The data constraints in the data model mainly describe the syntax, semantic relationships, constraints and dependencies between the data in the data structure, as well as the rules of data dynamic changes to ensure the correctness, validity and compatibility of the data.

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