09A

-- 09a: Find the top two customers
WITH line_totals AS (
 SELECT order_id,SUM(quantity*unit_price-line_discount) AS line_sales
 FROM aabha_sql.order_items GROUP BY order_id
), refund_totals AS (
 SELECT order_id,SUM(amount) AS refunded
 FROM aabha_sql.refunds WHERE refund_date < DATE '2025-04-01' GROUP BY order_id
), order_net AS (
 SELECT o.order_id,o.customer_id,o.order_date,o.channel,
 l.line_sales,COALESCE(r.refunded,0) AS refunded,
 l.line_sales-COALESCE(r.refunded,0) AS net_sales
 FROM aabha_sql.orders AS o
 JOIN line_totals AS l ON l.order_id=o.order_id
 LEFT JOIN refund_totals AS r ON r.order_id=o.order_id
 WHERE o.status='completed' AND o.order_date >= DATE '2025-01-01'
   AND o.order_date < DATE '2025-04-01'
), customer_sales AS (
 SELECT customer_id,SUM(net_sales) AS net_sales FROM order_net GROUP BY customer_id
), ranked AS (
 SELECT customer_id,net_sales,ROW_NUMBER() OVER (ORDER BY net_sales DESC,customer_id) AS position
 FROM customer_sales
)
SELECT customer_id,net_sales,position FROM ranked WHERE position<=2 ORDER BY position;