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Introduction
GROUPING SETS
Summary
15. Summary

## Instruction

Good job! It's time to wrap things up.

1. GROUP BY GROUPING SETS( ) works by creating the grouping levels provided explicitly within its parentheses.
2. You can use a pair of empty parentheses ( ) to introduce a general average, sum, etc.
3. The GROUPING SETS extension can be combined with both GROUPING_ID and COALESCE().
4. You can use both ROLLUP and CUBE to create even more sophisticated grouping combinations.

Okay, how about a short quiz now?

## Exercise

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