One line solution.
Code\n\n# Write your MySQL query statement below\nSELECT  customer_id FROM Customer GROUP BY customer_id\nHAVING COUNT(distinct product_key) = (SELECT COUNT(pro
# Code\n```\n# Write your MySQL query statement below\nSELECT  customer_id FROM Customer GROUP BY customer_id\nHAVING COUNT(distinct product_key) = (SELECT COUNT(product_key) FROM Product)\n```
['MySQL']