✅ 100% EASY || FAST 🔥|| CLEAN SOLUTION 🌟
IF THIS WILL BE HELPFUL TO YOU, PLEASE UPVOTE !\n# Code\n\n/* Write your PL/SQL query statement below */\nSELECT customer_id FROM Customer GROUP BY customer_id 
IF THIS WILL BE HELPFUL TO YOU, PLEASE UPVOTE !\n# Code\n```\n/* Write your PL/SQL query statement below */\nSELECT customer_id FROM Customer GROUP BY customer_id HAVING \n\nCOUNT(DISTINCT product_key) = (SELECT COUNT(*) FROM Product)\n```\n![5kej8w.jpg](https://assets.leetcode.com/users/images/8277a962-a3d0-44d3-b441-e4bbae047a8b_1691212838.5783477.jpeg)\n
['Database', 'Oracle']