Brief introduction of database classification

Brief introduction of database classification

1. Introduction to the database
A database is a warehouse for storing and managing data. The data is stored in a certain format. Users can add, modify, delete, and query data in the database.

2. Classification of the database

• Relational Database
• Non-relational database

Relational database:
refers to a database that uses a relational model to organize data. Simply put, a relational model refers to a two-dimensional table model, like a table in an Excel file, and emphasizes the use of tables to store data.
Core elements in relational databases

• Data row
• Data column
• data sheet
• Database (collection of data tables)

Commonly used relational databases:

• Oracle
• Microsoft SQL Server
• MySQL
• SQLite

Non-relational database:
Non-relational database, also known as NoSQL (Not Only SQL), means not only SQL, the most common definition of NoSQL is "non-relational", emphasizing the key-value method of storing data .

Commonly used non-relational databases:

• MongoDB
• Redis

3. The role of the database
The role of the database is to store and manage data, such as: the list of products we browsed on a certain Dong website, these data will be stored in the database.

4. The characteristics of the database

• Persistent storage
• Very high read and write speed
• Ensure the validity of data