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GROUP BY Extensions in PostgreSQL

Introduction
GROUP BY – Recap
ROLLUP
Summary

Instruction

Good job! It's your turn now—try a similar exercise with the delivery table.

Exercise

Show how much was spent on average for each category on each day and on each day in general. Show the following columns: category, delivery_date, and the average total_price (name the column avg_price). Do not show a single general average among all days and categories.

Stuck? Here's a hint!

Use:

GROUP BY 
  ROLLUP(category),
  delivery_date