Learn SQL: Primary Keys #sql

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👀 ‼️ EJERCICIOS SQL INTERMEDIO PARA ENTREVISTA 1️⃣ SQLite: Top 3 categorías con más revenue SELECT category, SUM(amount) AS total_revenue FROM SALES GROUP BY category ORDER BY total_revenue DESC LIMIT 3; 2️⃣ SQLite: Clientes que NO han comprado en Noviembre SELECT c.customer_id, c.name, c.category FROM customers c LEFT JOIN orders o ON c.customer_id = o.customer_id AND strftime('%m', o.order_date) = '11' AND strftime('%Y', o.order_date) = '2025' WHERE o.order_id IS NULL; 3️⃣ SQLite: Ventas prom