MySQL, the industry-leading open-source SQL database, is an accessible, easy-to-use relational database management system (RDBMS). As an alternative to Oracle and SQL server, MySQL offers features and capabilities that were once only available to users of expensive proprietary systems.
Notes: For a full list of changes go here. Upgrade from MySQL 5.7 to MySQL 8.0 is only supported using the in-place upgrade method. Downgrade from MySQL 8.0 to MySQL 5.7 (or from a MySQL 8.0 release to a previous MySQL 8.0 release) is not supported. The only supported alternative is to restore a backup taken before upgrading.