Microsoft SQL 2005 -- datetime, remove 1 hour ?

Below "[DateTime] - 1" gets the database
record's value and removes one day,
therefore 2015-08-07 11:47:06.000
becomes 2015-08-06 11:47:06.000

How can I change
to remove one hour instead,
therefore 2015-08-07 11:47:06.000
becomes 2015-08-07 10:47:06.000 ?

============================================

SELECT [ID]
      ,[DateTime] - 1
      ,[Type]
      ,[BadgeID]
FROM ...........
finance_teacherAsked:
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ste5anSenior DeveloperCommented:
DATETIME arithmetics: days.hours. Thus one hour is 1/24. Or use DATEADD():

SELECT  GETDATE() ,
        GETDATE() - 1 / 24.0 ,
        DATEADD(HOUR, -1, GETDATE());

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Microsoft SQL Server 2005

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