Introduction
GROUP BY – Recap
ROLLUP
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
