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SQL Server
A family of Microsoft relational database management and analysis systems for e-commerce, line-of-business, and data warehousing solutions.
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The tag sql-server-general indicates that this is a zone for discussing SQL Server issues (more on technical issues). For SQL server license issue, please call 1-800-426-9400, Monday through Friday, 6:00 A.M. to 6:00 P.M. (Pacific Time) to speak directly to a Microsoft licensing specialist. Or you can go to Volume Licensing Service Center support. Please choose region/language and choose to call or have web. People there will help you more effectively.
In addition, there is no version of SQL Server 2015（...,2014, 2016, 2017, 2019）.