Question

I am trying to get certain Dates that fit in timeslots from a table where

• the timeslot starts at the current DateTime floored to full hour
• the timeslot ends at the current DateTime floored to full hour plus 2 hours

so a DateTime that is 2011-06-24 09:21:40.020 could be between:

2011-06-24 09:00:00.000 AND 2011-06-24 11:00:00.000

Currently I’ve got this, but I think the nested DATEADD is a redundant. Is there a cleaner way to do this?

SELECT     dbo.Computer.ComputerName, dbo.Planned.DatePlanned
FROM       dbo.Computer INNER JOIN
           dbo.Planned ON dbo.Computer.ComputerID = dbo.Planned.ComputerID
WHERE      dbo.Planned.DatePlanned 
BETWEEN
(SELECT    DATEADD(Hour, DATEDIFF(Hour, 0, GETDATE()), 0)) 
AND
(SELECT    DATEADD(Hour, DATEDIFF(Hour, 0, DATEADD(Hour, 2, GETDATE())), 0))

This should give me all ComputerNames and Planned Dates in the current active timeslot.

Answer 1

I think it is cleaner to define those two variables:

DECLARE @Start DATETIME = DATEADD(Hour, DATEDIFF(Hour, 0, GETDATE()), 0)
DECLARE @End DATETIME = DATEADD(Hour, 2, @Start)

SELECT dbo.Computer.ComputerName, dbo.Planned.DatePlanned
FROM dbo.Computer 
    INNER JOIN dbo.Planned ON 
        dbo.Computer.ComputerID = dbo.Planned.ComputerID
WHERE dbo.Planned.DatePlanned 
BETWEEN @Start AND @End