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SQLServer Express Express edition is the entry-level, free database and is ideal for learning and building desktop and small server data-driven applications. It is the best choice for independent software vendors, developers, and hobbyists building client applications. If you need more advanced database features, SQL Server Express can be seamlessly upgraded to other higher end versions of SQL Server. SQL Server Express LocalDB, a lightweight version of Express that has all of its programmability features, yet runs in user mode, and has a fast, zero-configuration installation and a short list of prerequisites.
SQL Server Express 2005, 2008, 2012, 2014, 2016, 2017
本文档中所涉及的 SQLServer 均为 Express 版本，可以免费使用或分发。详情参考官方：许可条款
Express版本与企业版相比，功能更少（例：SQLServer 2016 各个版本功能对比）。另外，它针对服务器有如下的限制：不超过1个处理器，不超过10G数据存储
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