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Applies to: 
 SQL Server 
 Azure SQL Managed Instance
Returns the name of the registry key under which SQL Server is running. @@SERVICENAME returns 'MSSQLSERVER' if the current instance is the default instance; this function returns the instance name if the current instance is a named instance.
 Transact-SQL syntax conventions
Syntax
@@SERVICENAME  
Return Types
nvarchar
Remarks
SQL Server runs as a service named MSSQLServer.
Examples
The following example shows using @@SERVICENAME.
SELECT @@SERVICENAME AS 'Service Name';  
Here's the result set.
Service Name                    
------------------------------  
MSSQLSERVER                     
See Also
Configuration Functions (Transact-SQL)
Manage the Database Engine Services