Example of Detach Database Using Syntax SQL - sp_detach_db

/* Task for : Detach DB */
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-----code:start
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USE [master]
GO

ALTER DATABASE [DB_Test]
    SET  SINGLE_USER WITH ROLLBACK IMMEDIATE
GO

USE [master]
GO

EXEC master.dbo.sp_detach_db @dbname = N'DB_Test'
GO
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-----code:end
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Result Messages:
Command(s) completed successfully.