SQL Server Express is the free version intended for production use. It is ideal for small web applications, desktop apps, or learning environments. However, it comes with hardware and scale limitations: Maximum database size: 10GB per database.
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Standard is designed for mid-tier applications and data marts. It offers more scalability than Express, supporting up to 24 cores and 128GB of memory. Licensing is typically handled either per core or through a Server + CAL (Client Access License) model. SQL Server Enterprise Edition SQL Server Express is the free version intended