MYSQL NOT EXISTS WHERE NOT IN CTE
WITH cte as(\nSELECT distinct customer_id as customer_id\nFROM Customer)\n\nSELECT cte.customer_id\nFROM cte\nWHERE NOT EXISTS(\nSELECT product_key FROM Product
WITH cte as(\nSELECT distinct customer_id as customer_id\nFROM Customer)\n\nSELECT cte.customer_id\nFROM cte\nWHERE NOT EXISTS(\nSELECT product_key FROM Product\nWHERE product_key NOT IN(\nSELECT product_key FROM Customer c\nWHERE c.customer_id = cte.customer_id)\n)
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