The idea is using the " Count " clause
\n\n# Code\nmysql []\n# Write your MySQL query statement below\nSELECT customer_id \nFROM Customer \nGROUP BY customer_id \nHAVING COUNT(DISTINCT product_Key) =
\n\n# Code\n```mysql []\n# Write your MySQL query statement below\nSELECT customer_id \nFROM Customer \nGROUP BY customer_id \nHAVING COUNT(DISTINCT product_Key) = ( SELECT COUNT(product_Key) FROM Product);\n```
['MySQL']