SQL

SQL Query for Ranking Records within Groups

Use SQL window functions like ROW_NUMBER() or RANK() to assign ranks to records within defined groups, perfect for leaderboards or top N analyses.

SELECT
    product_id,
    category,
    sales,
    ROW_NUMBER() OVER (PARTITION BY category ORDER BY sales DESC) AS rank_in_category
FROM products_sales
WHERE sales > 0;

How it works: This query assigns a rank to each product based on its sales, but the ranking is done independently within each `category`. Products with higher sales get a lower rank (1 being the highest). The `PARTITION BY category` clause ensures that ranking restarts for each new category, ideal for finding top-selling items per category.

SQL Query for Ranking Records within Groups

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