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Steps.
Find database name / logical database name and file location.
Modify file location using commands.
Move physical files (mdf + ldf or just mdf if database is in simple mode)
Set database OFFLINE and ONLINE
ALTER DATABASE DBName
MODIFY FILE ( NAME = DBLogicalName_Data,
FILENAME = 'E:\New_location\DBName_Data.mdf');
GO
ALTER DATABASE DBName
MODIFY FILE ( NAME = DBLogicalName_Log,
FILENAME = 'E:\New_location\DBName_Log.ldf');
GO
ALTER DATABASE DBName SET OFFLINE;
GO
ALTER DATABASE DBName SET ONLINE;