✅EASY AND SIMPLE SOLUTION✅
\n# Code\n\n# Write your MySQL query statement below\nselect  \n    customer_id \nfrom \n    Customer \ngroup by \n    customer_id\nhaving \n    count(distinct 
\n# Code\n```\n# Write your MySQL query statement below\nselect  \n    customer_id \nfrom \n    Customer \ngroup by \n    customer_id\nhaving \n    count(distinct product_key) = (select count(product_key) from product)\n```
['MySQL']