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create table orders(consumer_id int,cuisine_id int);
insert into orders values
(1,100)
,(1,101)
,(2,101)
,(3,101)
,(3,101)
,(1,101)
,(4,100)
,(4,101)
,(4,102)
,(4,103)
,(5,100)
,(5,101)
,(5,102)
,(5,103)
;
14 rows affected
WITH CuisineDiversity AS (
SELECT consumer_id,
COUNT(DISTINCT cuisine_id) AS distinct_cuisines_tried,
row_number() OVER (ORDER BY COUNT(DISTINCT cuisine_id) DESC,consumer_id) AS diversity_rank
FROM orders
GROUP BY consumer_id
)
SELECT consumer_id,
distinct_cuisines_tried,
diversity_rank
FROM CuisineDiversity
ORDER BY
distinct_cuisines_tried DESC,
diversity_rank ASC,
consumer_id ASC;
| consumer_id | distinct_cuisines_tried | diversity_rank |
|---|---|---|
| 4 | 4 | 1 |
| 5 | 4 | 2 |
| 1 | 2 | 3 |
| 2 | 1 | 4 |
| 3 | 1 | 5 |