What are the three categories of database types?

A database is a "warehouse that organizes, stores and manages data according to data structure". It is a collection of large amounts of data that is stored in a computer for a long time, is organized, shareable, and unified management.

Databases are usually divided into three types:

(1) Hierarchical model database

(2) Network model database

(3) Relational model database

A database is a collection of data that is stored together in a certain way, can be shared with multiple users, has as little redundancy as possible, and is independent of applications. It can be regarded as an electronic filing cabinet—— A place where electronic files are stored. Users can add, query, update, delete and other operations on the data in the files.

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