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GROUP BY Extensions in PostgreSQL

Introduction
CUBE
Summary

Instruction

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

SELECT
  location,
  gender,
  risk,
  AVG(age) AS avg_age
FROM vaccine_administration
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.