Logical weekdays with Hot Deck

Calculate Total Fare Amount per Total Distance for each day of week. If the TripDistance is zero use the Hot Deck imputation function you created earlier in the chapter.

Este exercício faz parte do curso

Writing Functions and Stored Procedures in SQL Server

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Instruções do exercício

Use DATENAME() and PickupDate to select the day of week.
Use AVG() to calculate TotalAmount per TripDistance, and a CASE statement to select TripDistance if it's more than 0. If not, use dbo.GetTripDistanceHotDeck().
Order by the PickupDate day of week, with 'Monday' appearing first.

Exercício interativo prático

Experimente este exercício completando este código de exemplo.

SELECT
    -- Select the pickup day of week
	DATENAME(weekday, PickupDate) as DayofWeek,
    -- Calculate TotalAmount per TripDistance
	CAST(AVG(TotalAmount/
            -- Select TripDistance if it's more than 0
			CASE WHEN TripDistance > 0 THEN TripDistance
                 -- Use GetTripDistanceHotDeck()
     			 ELSE dbo.GetTripDistanceHotDeck() END) as decimal(10,2)) as 'AvgFare'
FROM YellowTripData
GROUP BY DATENAME(weekday, PickupDate)
-- Order by the PickupDate day of week
ORDER BY
     ___ ___ ___(weekday, PickupDate) = '___' THEN 1
         ___ ___(weekday, PickupDate) = '___' THEN 2
         ___ ___(weekday, PickupDate) = '___' THEN 3
         ___ ___(weekday, PickupDate) = '___' THEN 4
         ___ ___(weekday, PickupDate) = '___' THEN 5
         ___ ___(weekday, PickupDate) = '___' THEN 6
         ___ ___(weekday, PickupDate) = '___' THEN 7
END ASC;

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