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GROUP BY Extensions in PostgreSQL

Introduction
CUBE
Summary

Instruction

Good! Try a short exercise on your own now.

Exercise

Show the average damage repair costs for all grouping combinations based on the year and month columns. Group all rows by cause. Replace any NULL values in month with the word 'ALL'.

Show the following columns in the query result: year, month, cause, and avg_damage_repair_cost.

Stuck? Here's a hint!

Use the following template:

SELECT
  COALESCE(x, 'ALL') AS month,
  ...
FROM ...
GROUP BY 
  CUBE (x, y),
  z;