Subquery filtering powers complex business rules: find customers with above-average orders, products in top categories, users matching dynamic criteria.

Customer Segmentation

Identify high-value customers for targeted marketing

Customer Segmentation

WITH high_value AS (SELECT customer_id FROM orders GROUP BY customer_id HAVING SUM(total) > 10000) SELECT * FROM customers WHERE id IN (SELECT customer_id FROM high_value);

Marketing team targets high-value customers with exclusive offers. CTE makes logic clear and maintainable.

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