Instruction
Nicely done! Now it's your turn.
Exercise
Find the average principal (as AvgPrincipal) and average interest (as AvgInterest) for the following grouping combinations:
YearandQuarterCountry- None (overall averages)
Stuck? Here's a hint!
Use the template to help you:
SELECT A, B, ... FROM X GROUP BY GROUPING SETS ( (A), (B), () )



