I believe the only time you need to buy a license is if you want to distribute MySQL with your application (sort of like an embedded server).
Though, I would imagine sites like Facebook and Twitter purchased something completely different which is the "enterprise version", which also gets them support.
由于您只是使用提供的 MySQL 二进制文件，因此您没有义务发布任何代码（您没有对 MySQL 源代码进行任何更改，是吗）。
正如 @Nathan Adams 所说，如果您不想转售嵌入 MySQL 的应用程序，则不需要商业许可证。
As you are just using the MySQL binaries as provided, your not obliged to publish any code (You're not making any changes in MySQL sourcecode, do you).
As stated by @Nathan Adams you don't need a commerical licence if you don't want to resell an application with MySQL embedded.
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我相信您唯一需要购买许可证的情况是您想要将 MySQL 与您的应用程序（有点像嵌入式服务器）一起分发。
不过，我想像 Facebook 和 Twitter 这样的网站会购买完全不同的东西，即“企业版”，这也会得到他们的支持。
I believe the only time you need to buy a license is if you want to distribute MySQL with your application (sort of like an embedded server).
Though, I would imagine sites like Facebook and Twitter purchased something completely different which is the "enterprise version", which also gets them support.
简短回答：不，长回答：不
Short answer: nope, Long answer: nope
由于您只是使用提供的 MySQL 二进制文件，因此您没有义务发布任何代码（您没有对 MySQL 源代码进行任何更改，是吗）。
正如 @Nathan Adams 所说，如果您不想转售嵌入 MySQL 的应用程序，则不需要商业许可证。
As you are just using the MySQL binaries as provided, your not obliged to publish any code (You're not making any changes in MySQL sourcecode, do you).
As stated by @Nathan Adams you don't need a commerical licence if you don't want to resell an application with MySQL embedded.