select customer_id,count(order_id) as total_orders, sum(amount) as total_spend from orders group by customer_id having count(order_id) >=3 select name, price, case ...

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AND NOT EXISTS (SELECT 1 FROM wishlists WHERE user_id = 1 AND book_id = 1); -- Add another test item if more data exists INSERT IGNORE INTO wishlists (user_id, book ...

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