Instruction
Well done! How about Question 3?
Exercise
Find the average distance driven for the following grouping combinations:
Year,Month, andDayCountryandCarSize
Show the following columns in the query result: Year, Month, Day, Country, CarSize, and AvgDistance.
Stuck? Here's a hint!
The best way to go about this query is to use:
GROUP BY GROUPING SETS ( (A, B, C), (A, B) )



