# Find Monthly Top Customers Excluding High-Frequency Users Write one PostgreSQL SELECT statement or CTE query. Do not create, alter, or modify tables. ## Schema delivery_orders | column | type | description | |---|---|---| | delivery_id | integer | Unique delivery | | order_place_time | timestamp | Order placement time | | customer_id | integer | Customer | | restaurant_id | integer | Restaurant | | dasher_id | integer | Courier | ## Task For each calendar month, exclude customers with more than 30 deliveries in that month. Among the remaining customers, return every customer tied for the highest delivery count. ## Required Output Return order_month, customer_id, and delivery_count. Sort by month ascending and customer ID ascending. ## Constraints - High-frequency status is evaluated independently each month. - Return all ties. - Months with no remaining customer produce no row. ```hint Rank after filtering Count each customer-month, remove counts above 30, then use a tie-preserving rank within month. ```