
This licensing model provides access to an unlimited number of users or devices to connect from within or outside the organization. This model is used for servers with large or unknown number of clients. SQL Server Enterprise editions are licensed only by the model: “By number of cores”. SQL Server Standard can be licensed on either of two models (Server+CAL or Per Core).

Standard and Enterprise editions require licensing. The Developer and Express editions are distributed free of charge.
EDUCATION MICROSOFT SQL SERVER CLIENT ACCESS LICENSES LICENSE
Web Edition – special edition for web hosting (providers), distributed only under the Microsoft Services Provider License Agreement (SPLA).

Can be installed and used only for development, testing and demonstration on non-productive systems Includes the entire SQL Server technology stack. Developer Edition – free edition for developers.Express Edition – free edition for small installations, the maximum size of the database on disk – 10 GB, using RAM to 1 GB, 1 physical socket or 4 cores.

Microsoft SQL Server is available in five editions:
