👉🏻FAST AND EASY TO UNDERSTAND SOLUTION || MySQL
IntuitionApproachComplexity
Time complexity:

Space complexity:
Code
# Intuition
<!-- Describe your first thoughts on how to solve this problem. -->

# Approach
<!-- Describe your approach to solving the problem. -->

# Complexity
- Time complexity:
<!-- Add your time complexity here, e.g. $$O(n)$$ -->

- Space complexity:
<!-- Add your space complexity here, e.g. $$O(n)$$ -->

# Code
```mysql []
# Write your MySQL query statement below
WITH cte AS (SELECT *, COUNT(DISTINCT product_key) as cnt
                FROM Customer
                GROUP BY customer_id)
SELECT customer_id 
FROM cte
WHERE cnt = (SELECT COUNT(*)
                FROM Product)
```
['Database', 'MySQL']