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GROUP BY Extensions in MS SQL Server

Introduction
CUBE
Summary

Instruction

Good! There is one more interesting modification of CUBE worth mentioning. Take a look:

SELECT
  GROUPING_ID(Location, Gender, Risk) AS GroupingId,
  Location,
  Gender,
  Risk,
  AVG(Age) AS AvgAge
FROM VaccineAdministration
GROUP BY 
  CUBE ((Location, Gender), Risk);

Inside CUBE's parentheses, we put Location and Gender in another pair of parentheses! This means that Location and Gender will be treated as a single column — either both or neither of them will be used for grouping:

GROUP BY CUBE((Location, Gender), Risk) =
GROUP BY Location, Gender, Risk +
GROUP BY Location, Gender +
GROUP BY Risk +
GROUP BY ()

Exercise

Run the template query. Note that each row is grouped by either Location and Gender together or by neither of these columns.