What are the three elements of a data model?
The three elements of the data model are data structure, data operations and data constraints. The data model is an abstraction of data characteristics. It describes the static characteristics, dynamic behavior and constraints of the system from an abstract level, and provides an abstract framework for the information representation and operation of the database system.
#The operating environment of this tutorial: Windows 10 system, Dell G3 computer.
What are the three elements of the data model?
Detailed introduction:
The data model (Data Model) is an abstraction of data characteristics. It starts from the abstract It describes the static characteristics, dynamic behavior and constraints of the system at a high level, providing an abstract framework for the information representation and operation of the database system.
The content described by the data model includes three parts: data structure, data operations, and data constraints.
1. Data structure: The data structure in the data model mainly describes the type, content, nature of data and the relationship between data. Data structure is the basis of data model, and data operations and constraints are based on data structure. Different data structures have different operations and constraints.
2. Data operations: Data operations in the data model mainly describe the operation types and operation methods on the corresponding data structures.
3. Data constraints: Data constraints in the data model mainly describe the syntax and word meaning connections between data in the data structure, the constraints and dependencies between them, and the rules for dynamic changes in data to ensure the stability of the data. Correct, valid and compatible.
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