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This article will explain in detail how the database is established. The editor thinks it is very practical, so I share it for you as a reference. I hope you can get something after reading this article.

The database is based on the "data model". Data model is the simulation and abstraction of real-world data features. it describes the static characteristics, dynamic behavior and constraints of the system at the abstract level, and provides an abstract framework for the information representation and operation of the database system.

The database is based on the "data model".

The model can reveal the essential characteristics of things more vividly and intuitively, so that people can have a more comprehensive and in-depth understanding of things, which can help people to solve problems better. Using models to describe things is a method widely used by people in the process of understanding and transforming the world. The computer can not directly deal with the objective things in the real world, and the database system uses computer technology to manage the objective things, so it is necessary to abstract and simulate the objective things. in order to establish a data model suitable for database system management. Data model is the simulation and abstraction of real-world data characteristics.

Data model is a tool used to abstract the real world in database design, and it is a formal framework used to provide information representation and operation means in the database. Data model is the core and foundation of database system.

Constituent elements:

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

① data structure: the data structure in the data model mainly describes the type, content, nature and relationship of the data. Data structure is the foundation of data model, and data operations and constraints are based on data structure. Different data structures have different operations and constraints.

② data manipulation: the data operation in the data model mainly describes the operation type and operation mode on the corresponding data structure.

③ data constraints: data constraints in the data model mainly describe the syntax, semantic relations, constraints and dependencies between them, as well as the rules of dynamic changes of data, in order to ensure the correctness, effectiveness and compatibility of the data.

Data model classification:

1. Hierarchical model: the data is organized into an one-to-many relationship structure, and the tree structure is used to represent the entity and the relationship between entities.

2. Mesh model: using connection instructions or pointers to determine the mesh connection between data, which has many-to-many types of data organization.

3. Relational model: organize data in the form of record groups or data tables, so as to make use of the relationship between various entities and attributes for storage and transformation, without layering or pointers. It is a very effective data organization method to establish the relationship between spatial data and attribute data.

This is the end of the article on "how the database is established". I hope the above content can be of some help to you, so that you can learn more knowledge. if you think the article is good, please share it for more people to see.

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