1. What is a database?
Database, referred to as DB, is a warehouse that organizes, stores, and manages data according to the data structure. Users can add, delete, modify, and search for file data.
2. Common database products
① Oracle : a database system launched by oracle company. Advantages: good portability, easy to use, strong functionality, suitable for large, medium and small computer environments.
② SQL Server : The database system launched by Microsoft is widely used in e-commerce, banking, insurance, electric power and other industries. Disadvantages: Can only run on Windows platform.
③ MySQL : Open source database. Advantages: open source, fast, cross-platform, convenient, free and so on.
3. DB storage structure
4. Table structure
The horizontal direction of the data table is called "row", the vertical direction is called "column", and the data at the intersection of the row and column is called "value". Each row in the data table is called a "record", and the column name of each column is called a "field".
5. MySQL database
- Open source relational database management system
- Developed by MySQL AB in Sweden, it was acquired by Sun and Oracle successively
- In the field of web development, MySQL still occupies a pivotal position
6. Advantages of MySQL database:
① Low cost
MySQL is open source and free, and developers are free to modify it, reducing development costs.
② Cross-platform
It can be used not only on the Windows platform, but also on 14 platforms such as Linux and Macos.
③ High performance
The design of multithreading and sql algorithm enables it to make full use of CPU resources.
④Get started quickly
MySQL uses the standard SQL data language form, which is convenient for users to operate.
⑤ API interface
Provides APIs in multiple programming languages for easy operation of the database. Such as Java, C, C++, php, etc.