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GROUP BY Extensions in PostgreSQL

Introduction
CUBE
Summary

Instruction

All right, it's your turn now.

Exercise

Show the sum of damage_repair_cost for grouping combinations based on the columns year, month, and cause. Treat year and month as a single column.

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

Stuck? Here's a hint!

Use the following template:

SELECT
  ...
FROM ...
GROUP BY 
  CUBE ((x, y), z)