SQL - Finding SQL Server Installation Path

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If trying to automate creating databases you may need to get the installation path of the SQL Server instance you are connected to, to do this use the following query.
declare @rc int, @dir nvarchar(400) 
  
exec @rc = master.dbo.xp_instance_regread
      N'HKEY_LOCAL_MACHINE',
      N'Software\Microsoft\MSSQLServer\Setup',
      N'SQLPath', 
      @dir output, 'no_output'
select @dir AS InstallationDirectory

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