Queries with GROUPING SETS
What question CANNOT be answered by the following query?
SELECT
r.customer_id,
m.genre,
AVG(r.rating),
COUNT(*)
FROM renting AS r
LEFT JOIN movies AS m
ON r.movie_id = m.movie_id
GROUP BY GROUPING SETS ((r.customer_id, m.genre), (r.customer_id), ());
Answer the question
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