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GROUP BY Extensions in MS SQL Server

Introduction
GROUPING SETS
Summary

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:

  1. Year and Quarter
  2. Country
  3. 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),
  ()
)