SQL

Rank Rows Within Groups Using SQL Window Functions

Apply SQL window functions (ROW_NUMBER(), RANK()) to assign ranks within groups. Essential for leaderboards, top N results, and various analytical reporting needs.

SELECT
    order_id,
    customer_id,
    order_total,
    ROW_NUMBER() OVER (PARTITION BY customer_id ORDER BY order_total DESC) AS rn_customer_order,
    RANK() OVER (PARTITION BY customer_id ORDER BY order_total DESC) AS rank_customer_order
FROM
    orders;

How it works: This query demonstrates how to use `ROW_NUMBER()` and `RANK()` window functions. `PARTITION BY customer_id` divides the dataset into independent groups for each customer, and `ORDER BY order_total DESC` sorts orders within each group by their total amount. `ROW_NUMBER()` assigns a unique sequential integer to each row within its partition, while `RANK()` assigns the same rank to rows with identical `order_total` values within a partition.

Rank Rows Within Groups Using SQL Window Functions

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