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GROUP BY Extensions in PostgreSQL

Introduction
GROUP BY – Recap
ROLLUP
Summary

Instruction

Good job! You know the drill. It's your turn to write a similar query.

Exercise

Show how much was spent, on average: for each supplier, in each category, for each supplier in general; and in general among all suppliers and categories.

Show the following columns: supplier, category, the average total_price (rename the column to avg_price), and two new columns (S and C) denoting whether the columns supplier or category are used in the grouping (0 if used, 1 otherwise).