mysql 8.0 vs. 57 There are some notable differences, some of the main changes include:
1.Data Dictionary: MySQL 80 introduces the Data Dictionary, which is a collection of internal system tables that store database metadata. This change improves the maintainability and performance of the system.
2.JSON support improvements: MySQL 80 has improved support for JSON data types, including enhancements to JSON functions and operators, and support for new JSON path expressions.
3. *window functions：**mysql 8.0 introduces the window function, a powerful analytical query tool that allows calculations to be performed within the result set.
4. *common table expressions (ctes)：*8.0 introduces CTEs, which is a way to improve the readability and maintainability of queries.
5.InnoDB Engine Improvements: MySQL 80 made some improvements to the InnoDB storage engine, including improvements to spatial performance, encryption, and DDL operations.
6.New data type: MySQL 80 introduces new data types such as time with time zone and integer auto increment.
7.Security Enhancements: MySQL 80 provides more security features, including password expiration policies, stronger encryption, and access controls.
8.SQL Schema Changes: The default SQL schema has been changed to more strictly follow SQL standards.
These are just some of the major changes, depending on your use case and needs, and there may be other improvements. Before upgrading, it is recommended to consult the official MySQL documentation for more detailed information.