Use EDA to find impossible scenarios

Calculate how many YellowTripData records have each type of error discovered during EDA.

Deze oefening maakt deel uit van de cursus

Writing Functions and Stored Procedures in SQL Server

Oefeninstructies

Use CASE and COUNT to understand how many records contain the following errors:
DropOffDate before PickupDate, DropOffDate before today, PickupDate before today, TripDistance is zero.

Praktische interactieve oefening

Probeer deze oefening eens door deze voorbeeldcode in te vullen.

SELECT
	-- PickupDate is after today
	COUNT (CASE WHEN ___ > ___() THEN 1 END) AS 'FuturePickup',
    -- DropOffDate is after today
	COUNT (CASE WHEN ___ > ___() THEN 1 END) AS 'FutureDropOff',
    -- PickupDate is after DropOffDate
	COUNT (CASE WHEN ___ > ___ THEN 1 END) AS 'PickupBeforeDropoff',
    -- TripDistance is 0
	COUNT (CASE WHEN ___ = ___ THEN 1 END) AS 'ZeroTripDistance'  
FROM YellowTripData;

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