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Why don't you declare two variables (@Today and @Tomorrow) and select where date_shipped >= @Today and date_shipped < @Tomorrow

DECLARE @Today DATETIME
DECLARE @Tomorrow DATETIME

SET @Today = dateadd(dd, datediff(dd, 0, getdate()), 0)
SET @Tomorrow = dateadd(dd, datediff(dd, 0, getdate()) +1, 0)

PRINT @Today
PRINT @Tomorrow