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。 在本文中，参考发行编号（8.0.x），注意 MySQL 8.0 的小版本之间的差异。许可信息，参阅法律条款。
由于 MySQL 8.0 与以前版本在功能和其他方面存在许多差异，本手册不适用于较旧版本的 MySQL 软件。如果你使用的是较早发布的 MySQL 软件，请参阅对应的手册。例如，MySQL 5.7 参考手册涵盖 5.7 系列 MySQL 软件发布版本。
许可信息——MySQL 8.0。 本产品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，请参阅 MySQL 8.0 商业版许可证信息用户手册以获取许可信息，包括与此商业版中可能包含的第三方软件相关的许可信息。如果你使用的是 MySQL 8.0 社区版本，请参阅 MySQL 8.0 社区版本许可证信息用户手册以获取许可信息，包括与此社区版本中可能包含的第三方软件相关的许可信息。
许可信息——MySQL NDB Cluster 8.0。 如果你使用的是 MySQL NDB Cluster 8.0 社区版本，请参阅 MySQL NDB Cluster 8.0社区版本许可证信息用户手册以获取许可信息，包括与此社区版本中可能包含的第三方软件相关的许可信息。
法律条款
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