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SELECT DATEDIFF( hh,0,getdate())
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Declare @dt datetime = GETDATE()
@dt as now,
DATEADD(hh, -1, @dt) as one_hour_ago,
DATEADD(hh, -2, @dt) as two_hours_ago
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Declare @dt datetime = GETDATE(), @dt_rounded_by_hr datetime, @hr int
-- Grab the hour component
SELECT @hr = DATEPART(hour, @dt)
-- Round by hour: Parse a string for the day + hour component, format as date
SELECT @dt_rounded_by_hr =
CAST(LEFT(convert(varchar, @dt ,120), 11) +
RIGHT('0' + CAST(@hr as varchar(2)),2) +
':00:00' as datetime)
@dt_rounded_by_hr as now,
DATEADD(hh, -1, @dt_rounded_by_hr) as one_hour_ago,
DATEADD(hh, -2, @dt_rounded_by_hr) as two_hours_ago
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