SQL Express Decrement Column Value

    I have an SQL Express 2005 table 'Dispensations' with a 'DaysLeftToCompletion' integer column & a  'Status' nchar(10) column (amongst other columns). At midnight each day I wish to run a SQL script that will decrement the value in the 'DaysLeftToCompletion' column by 1 only if the 'Status' column has a value of 'Active'. If the 'DaysLeftToCompletion' value is zero then it should remain at zero.

Any help appreciated.
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Update TableName
Set DaysLeftToCompletion = DaysLeftToCompletion - 1
Where DaysLeftToCompletion > 0
AND Status = 'Active'

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Microsoft SQL Server 2005

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