# 前言和法律条款 这是 MySQL 数据库系统 v8.0 到 v8.0.18 的参考手册. Differences between minor versions of MySQL 8.0 are noted in the present text with reference to release numbers (8.0.***x***). 有关许可信息, 参阅[法律条款](#legal-notices). This manual is not intended for use with older versions of the MySQL software due to the many functional and other differences between MySQL 8.0 and previous versions. 如果你使用的是早期版本的 MySQL, 请参阅对应的手册. 例如, [*MySQL 5.7 参考手册*](https://dev.mysql.com/doc/refman/5.7/en/) 涵盖 5.7 系列 MySQL 软件版本. **许可信息—MySQL 8.0.** 该软件可能包含经许可使用的第三方软件. 如果你使用的是 MySQL 8.0 的商业版本, see the [MySQL 8.0 Commercial Release License Information User Manual](https://downloads.mysql.com/docs/licenses/mysqld-8.0-com-en.pdf) for licensing information, including licensing information relating to third-party software that may be included in this Commercial release. 如果你使用的是 MySQL 8.0 的社区版本, see the [MySQL 8.0 Community Release License Information User Manual](https://downloads.mysql.com/docs/licenses/mysqld-8.0-gpl-en.pdf) for licensing information, including licensing information relating to third-party software that may be included in this Community release. **许可信息—MySQL NDB Cluster 8.0.** If you are using a *Community* release of MySQL NDB Cluster 8.0, see the [MySQL NDB Cluster 8.0 Community Release License Information User Manual](https://downloads.mysql.com/docs/licenses/cluster-8.0-gpl-en.pdf) for licensing information, including licensing information relating to third-party software that may be included in this Community release. ## 法律条款 Copyright © 1997, 2019, Oracle and/or its affiliates. 保留所有权利. 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