Puteti folosi procedura stocata sp_attach_single_file_db ca in exemplul preluat din Books Online: 

USE master;
GO
EXEC sp_detach_db @dbname = 'AdventureWorks';
EXEC sp_attach_single_file_db @dbname = 'AdventureWorks',
    @physname = N'C:\Program Files\Microsoft SQL Server\MSSQL.1\MSSQL\Data\AdventureWorks_Data.mdf';

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Cristian Andrei Lefter, SQL Server MVP
MCT, MCSA, MCDBA, MCAD, MCSD .NET,
MCTS, MCITP - Database Administrator SQL Server 2005
http://sqlserver.ro