The traditional database structure is

The recognized standard structure in database field is three-level mode structure, including external mode, conceptual mode and internal mode.

1, external mode:

External schema, also known as user schema, is a description of the logical structure and characteristics of local data that database users (including programmers and end users) can see and use, and consists of several external record types or tables.

2. Conceptual model:

Conceptual architecture, also known as view, is a description of the logical structure of global data in the database and a public data view for all users (or applications).

3. Internal mode:

Internal schema, also known as physical schema, gives the physical storage structure and physical access methods of the database, such as file structure, index, aggregation and hash.

The purpose of the database field:

1, recording and managing information:

Databases can be used to store, retrieve, define and manage a large amount of information. For example, companies can use databases to store employee information, product information, customer information and so on. , and query and update when necessary.

2, tracking and analyzing data:

Database can be used to track and analyze various data, such as sales records, product feedback, user behavior and so on. By using the database, enterprises can deeply understand business operations and make better decisions.

3. Support application software:

Many software applications rely on databases to store and retrieve data. For example, an electronic sales platform needs to use a database to track inventory and process orders.

4. Support user customization:

Database can provide flexible data storage methods, and can sort, customize and store data according to users' needs, so as to better meet users' needs.

5, data security and backup:

Databases can provide high-level data security and backup capability. It can back up data to prevent data loss, and it can also protect the security of data by using encryption technology to prevent data from being accessed or tampered with by unauthorized personnel.