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| 1 | +WITH RECURSIVE customer_purchase_years AS ( |
| 2 | + SELECT customer_id,MIN(EXTRACT(YEAR FROM order_date)) AS min_year,MAX(EXTRACT(YEAR FROM order_date)) AS max_year |
| 3 | + FROM orders_2474 |
| 4 | + GROUP BY customer_id |
| 5 | +), |
| 6 | +all_years AS ( |
| 7 | + SELECT customer_id,min_year AS year,max_year |
| 8 | + FROM customer_purchase_years |
| 9 | + UNION |
| 10 | + SELECT customer_id,year+1 AS year,max_year |
| 11 | + FROM all_years |
| 12 | + WHERE year<max_year |
| 13 | +), |
| 14 | +all_year_purchases AS ( |
| 15 | + SELECT ay.customer_id,ay.year,COALESCE(SUM(o.price),0) AS total_purchase |
| 16 | + FROM all_years ay |
| 17 | + LEFT JOIN orders_2474 o ON ay.customer_id = o.customer_id AND ay.year = EXTRACT(YEAR FROM o.order_date) |
| 18 | + GROUP BY ay.customer_id,ay.year |
| 19 | +), |
| 20 | +ranked AS ( |
| 21 | + SELECT *, |
| 22 | + DENSE_RANK() OVER (PARTITION BY customer_id ORDER BY year) - |
| 23 | + DENSE_RANK() OVER (PARTITION BY customer_id ORDER BY total_purchase) AS diff |
| 24 | + FROM all_year_purchases |
| 25 | +) |
| 26 | +SELECT DISTINCT customer_id |
| 27 | +FROM ranked |
| 28 | +WHERE customer_id NOT IN (SELECT DISTINCT customer_id FROM ranked WHERE diff <> 0); |
| 29 | + |
| 30 | +--OR-- |
| 31 | + |
| 32 | +WITH cte AS( |
| 33 | + SELECT customer_id, EXTRACT(YEAR FROM order_date) AS year, price |
| 34 | + FROM orders_2474 |
| 35 | +), |
| 36 | +cte1 AS( |
| 37 | + SELECT customer_id,year,SUM(price) AS prices |
| 38 | + FROM cte |
| 39 | + GROUP BY customer_id,year |
| 40 | +), |
| 41 | +cte2 AS( |
| 42 | + SELECT *, |
| 43 | + DENSE_RANK() OVER(PARTITION BY customer_id ORDER BY prices) AS rn |
| 44 | + FROM cte1 |
| 45 | +), |
| 46 | +cte3 AS( |
| 47 | + SELECT DISTINCT customer_id,year-rn AS new_line |
| 48 | + FROM cte2 |
| 49 | +) |
| 50 | +SELECT customer_id |
| 51 | +FROM cte3 |
| 52 | +GROUP BY customer_id |
| 53 | +HAVING (COUNT(new_line)=1); |
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