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4. Question 2
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Find the maximum amount of fuel consumed for all grouping combinations involving the country, car_size, and trip_type columns. Show the following columns in the query result: country, car_size, trip_type, and max_fuel_consumed. Replace all NULL values in the first three columns with a double dash --.

Stuck? Here's a hint!

To replace NULL values with --, use the COALESCE() function. Here's an example:

COALESCE(country, '--') AS country