SQL, SQL Server
When you're referring to a computer that's running Microsoft SQL Server, use a computer running SQL Server or a computer that's running SQL Server. (Note the capital S in Server.)
When you're referring to Structured Query Language as SQL, treat SQL as an acronym pronounced “sequel” and use the indefinite article a: a SQL database.
Examples
Connect Power BI to an external data source, such as a SQL database.
Review installation requirements, system configuration checks, and security considerations for a SQL Server installation.
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