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GROUP BY Extensions in SQL

Introduction
GROUPING SETS
Summary

Instruction

Okay, it's time to practice GROUPING SETS.

Exercise

Rewrite the template query so it uses GROUPING SETS instead of UNION ALL.

Stuck? Here's a hint!

Use the template to help you:

SELECT
  A,
  B,
  ...
FROM X
GROUP BY GROUPING SETS
(
  (A),
  (B)
)