easy to understandable solution please visit once
\n\n# Code\nmysql []\n# Write your MySQL query statement below\nselect customer_id from Customer\ngroup by customer_id having count(distinct product_key)=(selec
\n\n# Code\n```mysql []\n# Write your MySQL query statement below\nselect customer_id from Customer\ngroup by customer_id having count(distinct product_key)=(select count(product_key) from product);\n```\n![001a585f-aef3-47c5-980d-77cfdbbe28fe_1702552970.456921.jpeg](https://assets.leetcode.com/users/images/927cff4d-78e4-4257-ab00-c20273b224a1_1724688518.66271.jpeg)\n
['MySQL']