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window_functions_row_number

🔢 Leverage Window Functions for Advanced Ranking​

Window functions like ROW_NUMBER(), RANK(), and NTILE() let you compute rankings and moving aggregates without subqueries. Use PARTITION BY to segment your data and ORDER BY to define the window frame.

SELECT
  user_id,
  purchase_amount,
  ROW_NUMBER() OVER (PARTITION BY user_id ORDER BY purchase_date DESC) AS recent_order_rank
FROM orders;

This query assigns a descending rank of each order per user, enabling you to filter or analyze top‐N results per partition.